/*----------------------------------------------------------------------------*/
void
coap_separate_resume(void *response, coap_separate_t *separate_store, uint8_t code)
{
coap_init_message(response, separate_store->type, code, separate_store->mid);
if (separate_store->token_len)
{
coap_set_header_token(response, separate_store->token, separate_store->token_len);
}
}
int ICACHE_FLASH_ATTR
lwm2m_observe(lwm2m_context_t * contextP,
uint16_t clientID,
lwm2m_uri_t * uriP,
lwm2m_result_callback_t callback,
void * userData)
{
lwm2m_client_t * clientP;
lwm2m_transaction_t * transactionP;
lwm2m_observation_t * observationP;
uint8_t token[4];
if (!LWM2M_URI_IS_SET_INSTANCE(uriP) && LWM2M_URI_IS_SET_RESOURCE(uriP)) return COAP_400_BAD_REQUEST;
clientP = (lwm2m_client_t *)lwm2m_list_find((lwm2m_list_t *)contextP->clientList, clientID);
if (clientP == NULL) return COAP_404_NOT_FOUND;
observationP = (lwm2m_observation_t *)lwm2m_malloc(sizeof(lwm2m_observation_t));
if (observationP == NULL) return COAP_500_INTERNAL_SERVER_ERROR;
c_memset(observationP, 0, sizeof(lwm2m_observation_t));
observationP->id = lwm2m_list_newId((lwm2m_list_t *)clientP->observationList);
c_memcpy(&observationP->uri, uriP, sizeof(lwm2m_uri_t));
observationP->clientP = clientP;
observationP->status = STATE_REG_PENDING;
observationP->callback = callback;
observationP->userData = userData;
token[0] = clientP->internalID >> 8;
token[1] = clientP->internalID & 0xFF;
token[2] = observationP->id >> 8;
token[3] = observationP->id & 0xFF;
transactionP = transaction_new(COAP_TYPE_CON, COAP_GET, clientP->altPath, uriP, contextP->nextMID++, 4, token, ENDPOINT_CLIENT, (void *)clientP);
if (transactionP == NULL)
{
lwm2m_free(observationP);
return COAP_500_INTERNAL_SERVER_ERROR;
}
observationP->clientP->observationList = (lwm2m_observation_t *)LWM2M_LIST_ADD(observationP->clientP->observationList, observationP);
coap_set_header_observe(transactionP->message, 0);
coap_set_header_token(transactionP->message, token, sizeof(token));
transactionP->callback = prv_obsRequestCallback;
transactionP->userData = (void *)observationP;
contextP->transactionList = (lwm2m_transaction_t *)LWM2M_LIST_ADD(contextP->transactionList, transactionP);
return transaction_send(contextP, transactionP);
}
/*-----------------------------------------------------------------------------------*/
void
coap_notify_observers(resource_t *resource, int32_t obs_counter, void *notification)
{
coap_packet_t *const coap_res = (coap_packet_t *) notification;
coap_observer_t* obs = NULL;
uint8_t preferred_type = coap_res->type;
PRINTF("Observing: Notification from %s\n", resource->url);
/* Iterate over observers. */
for (obs = (coap_observer_t*)list_head(observers_list); obs; obs = obs->next)
{
if (obs->url==resource->url) /* using RESOURCE url pointer as handle */
{
coap_transaction_t *transaction = NULL;
/*TODO implement special transaction for CON, sharing the same buffer to allow for more observers. */
if ( (transaction = coap_new_transaction(coap_get_mid(), &obs->addr, obs->port)) )
{
PRINTF(" Observer ");
PRINT6ADDR(&obs->addr);
PRINTF(":%u\n", obs->port);
/* Update last MID for RST matching. */
obs->last_mid = transaction->mid;
/* Prepare response */
coap_res->mid = transaction->mid;
coap_set_header_observe(coap_res, obs_counter);
coap_set_header_token(coap_res, obs->token, obs->token_len);
/* Use CON to check whether client is still there/interested after COAP_OBSERVING_REFRESH_INTERVAL. */
if (stimer_expired(&obs->refresh_timer))
{
PRINTF(" Refreshing with CON\n");
coap_res->type = COAP_TYPE_CON;
stimer_restart(&obs->refresh_timer);
}
else
{
coap_res->type = preferred_type;
}
transaction->packet_len = coap_serialize_message(coap_res, transaction->packet);
coap_send_transaction(transaction);
}
}
}
}
void ICACHE_FLASH_ATTR
lwm2m_resource_value_changed(lwm2m_context_t * contextP,
lwm2m_uri_t * uriP)
{
int result;
obs_list_t * listP;
lwm2m_watcher_t * watcherP;
listP = prv_getObservedList(contextP, uriP);
while (listP != NULL)
{
obs_list_t * targetP;
uint8_t * buffer = NULL;
size_t length = 0;
lwm2m_media_type_t format;
format = LWM2M_CONTENT_TEXT;
result = object_read(contextP, &listP->item->uri, &format, &buffer, &length);
if (result == COAP_205_CONTENT)
{
coap_packet_t message[1];
coap_init_message(message, COAP_TYPE_NON, COAP_205_CONTENT, 0);
coap_set_header_content_type(message, format);
coap_set_payload(message, buffer, length);
for (watcherP = listP->item->watcherList ; watcherP != NULL ; watcherP = watcherP->next)
{
watcherP->lastMid = contextP->nextMID++;
message->mid = watcherP->lastMid;
coap_set_header_token(message, watcherP->token, watcherP->tokenLen);
coap_set_header_observe(message, watcherP->counter++);
(void)message_send(contextP, message, watcherP->server->sessionH);
}
}
targetP = listP;
listP = listP->next;
lwm2m_free(targetP);
}
}
/*-----------------------------------------------------------------------------------*/
void
coap_notify_observers(const char *url, int type, uint32_t observe, uint8_t *payload, size_t payload_len)
{
coap_observer_t* obs = NULL;
for (obs = (coap_observer_t*)list_head(observers_list); obs; obs = obs->next)
{
if (obs->url==url) /* using RESOURCE url string as handle */
{
coap_transaction_t *transaction = NULL;
/*TODO implement special transaction for CON, sharing the same buffer to allow for more observers */
if ( (transaction = coap_new_transaction(coap_get_tid(), &obs->addr, obs->port)) )
{
/* Use CON to check whether client is still there/interested after COAP_OBSERVING_REFRESH_INTERVAL. */
if (stimer_expired(&obs->refresh_timer))
{
PRINTF("Observing: Refresh client with CON\n");
type = COAP_TYPE_CON;
stimer_restart(&obs->refresh_timer);
}
/* prepare response */
coap_packet_t push[1]; /* This way the packet can be treated as pointer as usual. */
coap_init_message(push, (coap_message_type_t)type, OK_200, transaction->tid );
coap_set_header_observe(push, observe);
coap_set_header_token(push, obs->token, obs->token_len);
coap_set_payload(push, payload, payload_len);
transaction->packet_len = coap_serialize_message(push, transaction->packet);
PRINTF("Observing: Notify from /%s for ", url);
PRINT6ADDR(&obs->addr);
PRINTF(":%u\n", obs->port);
PRINTF(" %.*s\n", payload_len, payload);
coap_send_transaction(transaction);
}
}
}
}
void lwm2m_resource_value_changed(lwm2m_context_t * contextP,
lwm2m_uri_t * uriP)
{
int result;
obs_list_t * listP;
lwm2m_watcher_t * watcherP;
listP = prv_getObservedList(contextP, uriP);
while (listP != NULL)
{
obs_list_t * targetP;
char * buffer = NULL;
int length = 0;
result = object_read(contextP, &listP->item->uri, &buffer, &length);
if (result == COAP_205_CONTENT)
{
coap_packet_t message[1];
coap_init_message(message, COAP_TYPE_ACK, COAP_204_CHANGED, 0);
coap_set_payload(message, buffer, length);
for (watcherP = listP->item->watcherList ; watcherP != NULL ; watcherP = watcherP->next)
{
watcherP->lastMid = contextP->nextMID++;
message->mid = watcherP->lastMid;
coap_set_header_token(message, watcherP->token, watcherP->tokenLen);
coap_set_header_observe(message, watcherP->counter++);
(void)message_send(contextP, message, watcherP->server->addr, watcherP->server->addrLen);
}
}
targetP = listP;
listP = listP->next;
lwm2m_free(targetP);
}
}
/*----------------------------------------------------------------------------*/
static
int
coap_receive(void)
{
coap_error_code = NO_ERROR;
PRINTF("handle_incoming_data(): received uip_datalen=%u \n",(uint16_t)uip_datalen());
/* Static declaration reduces stack peaks and program code size. */
static coap_packet_t message[1]; /* This way the packet can be treated as pointer as usual. */
static coap_packet_t response[1];
static coap_transaction_t *transaction = NULL;
if (uip_newdata()) {
PRINTF("receiving UDP datagram from: ");
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
PRINTF(":%u\n Length: %u\n Data: ", uip_ntohs(UIP_UDP_BUF->srcport), uip_datalen() );
PRINTBITS(uip_appdata, uip_datalen());
PRINTF("\n");
coap_error_code = coap_parse_message(message, uip_appdata, uip_datalen());
if (coap_error_code==NO_ERROR)
{
/*TODO duplicates suppression, if required by application */
PRINTF(" Parsed: v %u, t %u, oc %u, c %u, mid %u\n", message->version, message->type, message->option_count, message->code, message->mid);
PRINTF(" URL: %.*s\n", message->uri_path_len, message->uri_path);
PRINTF(" Payload: %.*s\n", message->payload_len, message->payload);
/* Handle requests. */
if (message->code >= COAP_GET && message->code <= COAP_DELETE)
{
/* Use transaction buffer for response to confirmable request. */
if ( (transaction = coap_new_transaction(message->mid, &UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport)) )
{
uint32_t block_num = 0;
uint16_t block_size = REST_MAX_CHUNK_SIZE;
uint32_t block_offset = 0;
int32_t new_offset = 0;
/* prepare response */
if (message->type==COAP_TYPE_CON)
{
/* Reliable CON requests are answered with an ACK. */
coap_init_message(response, COAP_TYPE_ACK, CONTENT_2_05, message->mid);
}
else
{
/* Unreliable NON requests are answered with a NON as well. */
coap_init_message(response, COAP_TYPE_NON, CONTENT_2_05, coap_get_mid());
}
/* resource handlers must take care of different handling (e.g., TOKEN_OPTION_REQUIRED_240) */
if (IS_OPTION(message, COAP_OPTION_TOKEN))
{
coap_set_header_token(response, message->token, message->token_len);
SET_OPTION(response, COAP_OPTION_TOKEN);
}
/* get offset for blockwise transfers */
if (coap_get_header_block2(message, &block_num, NULL, &block_size, &block_offset))
{
PRINTF("Blockwise: block request %lu (%u/%u) @ %lu bytes\n", block_num, block_size, REST_MAX_CHUNK_SIZE, block_offset);
block_size = MIN(block_size, REST_MAX_CHUNK_SIZE);
new_offset = block_offset;
}
/* Invoke resource handler. */
if (service_cbk)
{
/* Call REST framework and check if found and allowed. */
if (service_cbk(message, response, transaction->packet+COAP_MAX_HEADER_SIZE, block_size, &new_offset))
{
if (coap_error_code==NO_ERROR)
{
/* Apply blockwise transfers. */
if ( IS_OPTION(message, COAP_OPTION_BLOCK1) && response->code<BAD_REQUEST_4_00 && !IS_OPTION(response, COAP_OPTION_BLOCK1) )
{
PRINTF("Block1 NOT IMPLEMENTED\n");
coap_error_code = NOT_IMPLEMENTED_5_01;
coap_error_message = "NoBlock1Support";
}
else if ( IS_OPTION(message, COAP_OPTION_BLOCK2) )
{
/* unchanged new_offset indicates that resource is unaware of blockwise transfer */
if (new_offset==block_offset)
{
PRINTF("Blockwise: unaware resource with payload length %u/%u\n", response->payload_len, block_size);
if (block_offset >= response->payload_len)
{
PRINTF("handle_incoming_data(): block_offset >= response->payload_len\n");
response->code = BAD_OPTION_4_02;
coap_set_payload(response, "BlockOutOfScope", 15); /* a const char str[] and sizeof(str) produces larger code size */
}
else
{
coap_set_header_block2(response, block_num, response->payload_len - block_offset > block_size, block_size);
coap_set_payload(response, response->payload+block_offset, MIN(response->payload_len - block_offset, block_size));
} /* if (valid offset) */
}
else
{
/* resource provides chunk-wise data */
PRINTF("Blockwise: blockwise resource, new offset %ld\n", new_offset);
coap_set_header_block2(response, block_num, new_offset!=-1 || response->payload_len > block_size, block_size);
if (response->payload_len > block_size) coap_set_payload(response, response->payload, block_size);
} /* if (resource aware of blockwise) */
}
else if (new_offset!=0)
{
PRINTF("Blockwise: no block option for blockwise resource, using block size %u\n", REST_MAX_CHUNK_SIZE);
coap_set_header_block2(response, 0, new_offset!=-1, REST_MAX_CHUNK_SIZE);
coap_set_payload(response, response->payload, MIN(response->payload_len, REST_MAX_CHUNK_SIZE));
} /* if (blockwise request) */
} /* no errors/hooks */
} /* successful service callback */
/* Serialize response. */
if (coap_error_code==NO_ERROR)
{
if ((transaction->packet_len = coap_serialize_message(response, transaction->packet))==0)
{
coap_error_code = PACKET_SERIALIZATION_ERROR;
}
}
}
else
{
coap_error_code = NOT_IMPLEMENTED_5_01;
coap_error_message = "NoServiceCallbck"; // no a to fit 16 bytes
} /* if (service callback) */
} else {
coap_error_code = SERVICE_UNAVAILABLE_5_03;
coap_error_message = "NoFreeTraBuffer";
} /* if (transaction buffer) */
}
else
{
/* Responses */
if (message->type==COAP_TYPE_ACK)
{
PRINTF("Received ACK\n");
}
else if (message->type==COAP_TYPE_RST)
{
PRINTF("Received RST\n");
/* Cancel possible subscriptions. */
coap_remove_observer_by_mid(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport, message->mid);
}
transaction = coap_get_transaction_by_mid(message->mid);
if (message->type != COAP_TYPE_CON && transaction)
{
/* Free transaction memory before callback, as it may create a new transaction. */
restful_response_handler callback = transaction->callback;
void *callback_data = transaction->callback_data;
coap_clear_transaction(transaction);
/* Check if someone registered for the response */
if (callback) {
callback(callback_data, message);
}
} /* if (ACKed transaction) */
/* Observe notification */
if ((message->type == COAP_TYPE_CON || message->type == COAP_TYPE_NON) \
&& IS_OPTION(message, COAP_OPTION_OBSERVE)) {
PRINTF("Observe [%u]\n", message->observe);
coap_handle_notification(&UIP_IP_BUF->srcipaddr, \
UIP_UDP_BUF->srcport, message);
}
transaction = NULL;
} /* Request or Response */
} /* if (parsed correctly) */
if (coap_error_code==NO_ERROR)
{
if (transaction) coap_send_transaction(transaction);
}
else if (coap_error_code==MANUAL_RESPONSE)
{
PRINTF("Clearing transaction for manual response");
coap_clear_transaction(transaction);
}
else
{
PRINTF("ERROR %u: %s\n", coap_error_code, coap_error_message);
coap_clear_transaction(transaction);
/* Set to sendable error code. */
if (coap_error_code >= 192)
{
coap_error_code = INTERNAL_SERVER_ERROR_5_00;
}
/* Reuse input buffer for error message. */
coap_init_message(message, COAP_TYPE_ACK, coap_error_code, message->mid);
coap_set_payload(message, coap_error_message, strlen(coap_error_message));
coap_send_message(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport, uip_appdata, coap_serialize_message(message, uip_appdata));
}
} /* if (new data) */
return coap_error_code;
}
void observe_step(lwm2m_context_t * contextP,
time_t currentTime,
time_t * timeoutP)
{
lwm2m_observed_t * targetP;
for (targetP = contextP->observedList ; targetP != NULL ; targetP = targetP->next)
{
lwm2m_watcher_t * watcherP;
uint8_t * buffer = NULL;
size_t length = 0;
lwm2m_data_t * dataP = NULL;
int size = 0;
double floatValue = 0;
int64_t integerValue = 0;
bool storeValue = false;
lwm2m_media_type_t format = LWM2M_CONTENT_TEXT;
coap_packet_t message[1];
time_t interval;
if (LWM2M_URI_IS_SET_RESOURCE(&targetP->uri))
{
if (COAP_205_CONTENT != object_readData(contextP, &targetP->uri, &size, &dataP)) continue;
switch (dataP->type)
{
case LWM2M_TYPE_INTEGER:
if (1 != lwm2m_data_decode_int(dataP, &integerValue)) continue;
storeValue = true;
break;
case LWM2M_TYPE_FLOAT:
if (1 != lwm2m_data_decode_float(dataP, &floatValue)) continue;
storeValue = true;
break;
default:
break;
}
}
for (watcherP = targetP->watcherList ; watcherP != NULL ; watcherP = watcherP->next)
{
if (watcherP->active == true)
{
bool notify = false;
if (watcherP->update == true)
{
// value changed, should we notify the server ?
if (watcherP->parameters == NULL || watcherP->parameters->toSet == 0)
{
// no conditions
notify = true;
LOG("observation_step(/%d/%d/%d) notify[1] = TRUE\n", targetP->uri.objectId, targetP->uri.instanceId, targetP->uri.resourceId);
}
if (notify == false
&& watcherP->parameters != NULL
&& (watcherP->parameters->toSet & ATTR_FLAG_NUMERIC) != 0)
{
if ((watcherP->parameters->toSet & LWM2M_ATTR_FLAG_LESS_THAN) != 0)
{
// Did we cross the lower treshold ?
switch (dataP->type)
{
case LWM2M_TYPE_INTEGER:
if ((integerValue <= watcherP->parameters->lessThan
&& watcherP->lastValue.asInteger > watcherP->parameters->lessThan)
|| (integerValue >= watcherP->parameters->lessThan
&& watcherP->lastValue.asInteger < watcherP->parameters->lessThan))
{
notify = true;
}
break;
case LWM2M_TYPE_FLOAT:
if ((floatValue <= watcherP->parameters->lessThan
&& watcherP->lastValue.asFloat > watcherP->parameters->lessThan)
|| (floatValue >= watcherP->parameters->lessThan
&& watcherP->lastValue.asFloat < watcherP->parameters->lessThan))
{
notify = true;
}
break;
default:
break;
}
LOG("observation_step(/%d/%d/%d) notify[2] = %s\n", targetP->uri.objectId, targetP->uri.instanceId, targetP->uri.resourceId, notify ? "TRUE" : "FALSE");
}
if ((watcherP->parameters->toSet & LWM2M_ATTR_FLAG_GREATER_THAN) != 0)
{
// Did we cross the upper treshold ?
switch (dataP->type)
{
case LWM2M_TYPE_INTEGER:
if ((integerValue <= watcherP->parameters->greaterThan
&& watcherP->lastValue.asInteger > watcherP->parameters->greaterThan)
|| (integerValue >= watcherP->parameters->greaterThan
&& watcherP->lastValue.asInteger < watcherP->parameters->greaterThan))
{
notify = true;
}
break;
case LWM2M_TYPE_FLOAT:
if ((floatValue <= watcherP->parameters->greaterThan
&& watcherP->lastValue.asFloat > watcherP->parameters->greaterThan)
|| (floatValue >= watcherP->parameters->greaterThan
&& watcherP->lastValue.asFloat < watcherP->parameters->greaterThan))
{
notify = true;
}
break;
default:
break;
}
LOG("observation_step(/%d/%d/%d) notify[3] = %s\n", targetP->uri.objectId, targetP->uri.instanceId, targetP->uri.resourceId, notify ? "TRUE" : "FALSE");
}
if ((watcherP->parameters->toSet & LWM2M_ATTR_FLAG_STEP) != 0)
{
switch (dataP->type)
{
case LWM2M_TYPE_INTEGER:
{
int64_t diff;
diff = integerValue - watcherP->lastValue.asInteger;
if ((diff < 0 && (0 - diff) >= watcherP->parameters->step)
|| (diff >= 0 && diff >= watcherP->parameters->step))
{
notify = true;
}
}
break;
case LWM2M_TYPE_FLOAT:
{
double diff;
diff = floatValue - watcherP->lastValue.asFloat;
if ((diff < 0 && (0 - diff) >= watcherP->parameters->step)
|| (diff >= 0 && diff >= watcherP->parameters->step))
{
notify = true;
}
}
break;
default:
break;
}
LOG("observation_step(/%d/%d/%d) notify[4] = %s\n", targetP->uri.objectId, targetP->uri.instanceId, targetP->uri.resourceId, notify? "TRUE" : "FALSE");
}
}
if (watcherP->parameters != NULL
&& (watcherP->parameters->toSet & LWM2M_ATTR_FLAG_MIN_PERIOD) != 0)
{
if (watcherP->lastTime + watcherP->parameters->minPeriod > currentTime)
{
// Minimum Period did not elapse yet
interval = watcherP->lastTime + watcherP->parameters->minPeriod - currentTime;
if (*timeoutP > interval) *timeoutP = interval;
notify = false;
}
else
{
notify = true;
}
LOG("observation_step(/%d/%d/%d) notify[5] = %s\n", targetP->uri.objectId, targetP->uri.instanceId, targetP->uri.resourceId, notify ? "TRUE" : "FALSE");
}
}
// Is the Maximum Period reached ?
if (notify == false
&& watcherP->parameters != NULL
&& (watcherP->parameters->toSet & LWM2M_ATTR_FLAG_MAX_PERIOD) != 0)
{
if (watcherP->lastTime + watcherP->parameters->maxPeriod <= currentTime)
{
notify = true;
}
LOG("observation_step(/%d/%d/%d) notify[6] = %s\n", targetP->uri.objectId, targetP->uri.instanceId, targetP->uri.resourceId, notify ? "TRUE" : "FALSE");
}
if (notify == true)
{
if (buffer == NULL)
{
if (dataP != NULL)
{
length = lwm2m_data_serialize(&targetP->uri, size, dataP, &format, &buffer);
if (length == 0) break;
}
else
{
if (COAP_205_CONTENT != object_read(contextP, &targetP->uri, &format, &buffer, &length))
{
buffer = NULL;
break;
}
}
coap_init_message(message, COAP_TYPE_NON, COAP_205_CONTENT, 0);
coap_set_header_content_type(message, format);
coap_set_payload(message, buffer, length);
LOG("Observe Update[/%d/%d/%d]: %.*s\n", targetP->uri.objectId, targetP->uri.instanceId, targetP->uri.resourceId, length, buffer);
}
watcherP->lastTime = currentTime;
watcherP->lastMid = contextP->nextMID++;
message->mid = watcherP->lastMid;
coap_set_header_token(message, watcherP->token, watcherP->tokenLen);
coap_set_header_observe(message, watcherP->counter++);
(void)message_send(contextP, message, watcherP->server->sessionH);
watcherP->update = false;
}
// Store this value
if (notify == true && storeValue == true)
{
switch (dataP->type)
{
case LWM2M_TYPE_INTEGER:
watcherP->lastValue.asInteger = integerValue;
break;
case LWM2M_TYPE_FLOAT:
watcherP->lastValue.asFloat = floatValue;
break;
default:
break;
}
}
if (watcherP->parameters != NULL && (watcherP->parameters->toSet & LWM2M_ATTR_FLAG_MAX_PERIOD) != 0)
{
// update timers
interval = watcherP->lastTime + watcherP->parameters->maxPeriod - currentTime;
if (*timeoutP > interval) *timeoutP = interval;
}
}
}
if (dataP != NULL) lwm2m_data_free(size, dataP);
if (buffer != NULL) lwm2m_free(buffer);
}
}
/* This function is an adaptation of function coap_receive() from Erbium's er-coap-13-engine.c.
* Erbium is Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
* All rights reserved.
*/
void lwm2m_handle_packet(lwm2m_context_t * contextP,
uint8_t * buffer,
int length,
void * fromSessionH)
{
coap_status_t coap_error_code = NO_ERROR;
static coap_packet_t message[1];
static coap_packet_t response[1];
coap_error_code = coap_parse_message(message, buffer, (uint16_t)length);
if (coap_error_code==NO_ERROR)
{
LOG(" Parsed: ver %u, type %u, tkl %u, code %u, mid %u\r\n", message->version, message->type, message->token_len, message->code, message->mid);
LOG(" Payload: %.*s\r\n\n", message->payload_len, message->payload);
if (message->code >= COAP_GET && message->code <= COAP_DELETE)
{
uint32_t block_num = 0;
uint16_t block_size = REST_MAX_CHUNK_SIZE;
uint32_t block_offset = 0;
int32_t new_offset = 0;
/* prepare response */
if (message->type==COAP_TYPE_CON)
{
/* Reliable CON requests are answered with an ACK. */
coap_init_message(response, COAP_TYPE_ACK, CONTENT_2_05, message->mid);
}
else
{
/* Unreliable NON requests are answered with a NON as well. */
coap_init_message(response, COAP_TYPE_NON, CONTENT_2_05, coap_get_mid());
}
/* mirror token */
if (message->token_len)
{
coap_set_header_token(response, message->token, message->token_len);
}
/* get offset for blockwise transfers */
if (coap_get_header_block2(message, &block_num, NULL, &block_size, &block_offset))
{
LOG("Blockwise: block request %u (%u/%u) @ %u bytes\n", block_num, block_size, REST_MAX_CHUNK_SIZE, block_offset);
block_size = MIN(block_size, REST_MAX_CHUNK_SIZE);
new_offset = block_offset;
}
coap_error_code = handle_request(contextP, fromSessionH, message, response);
if (coap_error_code==NO_ERROR)
{
/* Apply blockwise transfers. */
if ( IS_OPTION(message, COAP_OPTION_BLOCK1) && response->code<BAD_REQUEST_4_00 && !IS_OPTION(response, COAP_OPTION_BLOCK1) )
{
LOG("Block1 NOT IMPLEMENTED\n");
coap_error_code = NOT_IMPLEMENTED_5_01;
coap_error_message = "NoBlock1Support";
}
else if ( IS_OPTION(message, COAP_OPTION_BLOCK2) )
{
/* unchanged new_offset indicates that resource is unaware of blockwise transfer */
if (new_offset==block_offset)
{
LOG("Blockwise: unaware resource with payload length %u/%u\n", response->payload_len, block_size);
if (block_offset >= response->payload_len)
{
LOG("handle_incoming_data(): block_offset >= response->payload_len\n");
response->code = BAD_OPTION_4_02;
coap_set_payload(response, "BlockOutOfScope", 15); /* a const char str[] and sizeof(str) produces larger code size */
}
else
{
coap_set_header_block2(response, block_num, response->payload_len - block_offset > block_size, block_size);
coap_set_payload(response, response->payload+block_offset, MIN(response->payload_len - block_offset, block_size));
} /* if (valid offset) */
}
else
{
/* resource provides chunk-wise data */
LOG("Blockwise: blockwise resource, new offset %d\n", new_offset);
coap_set_header_block2(response, block_num, new_offset!=-1 || response->payload_len > block_size, block_size);
if (response->payload_len > block_size) coap_set_payload(response, response->payload, block_size);
} /* if (resource aware of blockwise) */
}
else if (new_offset!=0)
{
LOG("Blockwise: no block option for blockwise resource, using block size %u\n", REST_MAX_CHUNK_SIZE);
coap_set_header_block2(response, 0, new_offset!=-1, REST_MAX_CHUNK_SIZE);
coap_set_payload(response, response->payload, MIN(response->payload_len, REST_MAX_CHUNK_SIZE));
} /* if (blockwise request) */
coap_error_code = message_send(contextP, response, fromSessionH);
lwm2m_free(response->payload);
response->payload = NULL;
response->payload_len = 0;
}
else
{
coap_error_code = message_send(contextP, response, fromSessionH);
}
}
else
{
/* Responses */
lwm2m_transaction_t * transaction;
if (message->type==COAP_TYPE_ACK)
{
LOG("Received ACK\n");
}
else if (message->type==COAP_TYPE_RST)
{
LOG("Received RST\n");
/* Cancel possible subscriptions. */
handle_reset(contextP, fromSessionH, message);
}
#ifdef LWM2M_SERVER_MODE
if (message->code == COAP_204_CHANGED
&& IS_OPTION(message, COAP_OPTION_OBSERVE))
{
handle_observe_notify(contextP, fromSessionH, message);
}
else
#endif
{
transaction_handle_response(contextP, fromSessionH, message);
}
} /* Request or Response */
coap_free_header(message);
} /* if (parsed correctly) */
else
{
LOG("Message parsing failed %d\r\n", coap_error_code);
}
if (coap_error_code != NO_ERROR)
{
LOG("ERROR %u: %s\n", coap_error_code, coap_error_message);
/* Set to sendable error code. */
if (coap_error_code >= 192)
{
coap_error_code = INTERNAL_SERVER_ERROR_5_00;
}
/* Reuse input buffer for error message. */
coap_init_message(message, COAP_TYPE_ACK, coap_error_code, message->mid);
coap_set_payload(message, coap_error_message, strlen(coap_error_message));
message_send(contextP, message, fromSessionH);
}
}
lwm2m_transaction_t * transaction_new(void * sessionH,
coap_method_t method,
char * altPath,
lwm2m_uri_t * uriP,
uint16_t mID,
uint8_t token_len,
uint8_t* token)
{
lwm2m_transaction_t * transacP;
int result;
LOG_ARG("method: %d, altPath: \"%s\", mID: %d, token_len: %d",
method, altPath, mID, token_len);
LOG_URI(uriP);
// no transactions without peer
if (NULL == sessionH) return NULL;
transacP = (lwm2m_transaction_t *)lwm2m_malloc(sizeof(lwm2m_transaction_t));
if (NULL == transacP) return NULL;
memset(transacP, 0, sizeof(lwm2m_transaction_t));
transacP->message = lwm2m_malloc(sizeof(coap_packet_t));
if (NULL == transacP->message) goto error;
coap_init_message(transacP->message, COAP_TYPE_CON, method, mID);
transacP->peerH = sessionH;
transacP->mID = mID;
if (altPath != NULL)
{
// TODO: Support multi-segment alternative path
coap_set_header_uri_path_segment(transacP->message, altPath + 1);
}
if (NULL != uriP)
{
char stringID[LWM2M_STRING_ID_MAX_LEN];
result = utils_intToText(uriP->objectId, (uint8_t*)stringID, LWM2M_STRING_ID_MAX_LEN);
if (result == 0) goto error;
stringID[result] = 0;
coap_set_header_uri_path_segment(transacP->message, stringID);
if (LWM2M_URI_IS_SET_INSTANCE(uriP))
{
result = utils_intToText(uriP->instanceId, (uint8_t*)stringID, LWM2M_STRING_ID_MAX_LEN);
if (result == 0) goto error;
stringID[result] = 0;
coap_set_header_uri_path_segment(transacP->message, stringID);
}
else
{
if (LWM2M_URI_IS_SET_RESOURCE(uriP))
{
coap_set_header_uri_path_segment(transacP->message, NULL);
}
}
if (LWM2M_URI_IS_SET_RESOURCE(uriP))
{
result = utils_intToText(uriP->resourceId, (uint8_t*)stringID, LWM2M_STRING_ID_MAX_LEN);
if (result == 0) goto error;
stringID[result] = 0;
coap_set_header_uri_path_segment(transacP->message, stringID);
}
}
if (0 < token_len)
{
if (NULL != token)
{
coap_set_header_token(transacP->message, token, token_len);
}
else {
// generate a token
uint8_t temp_token[COAP_TOKEN_LEN];
time_t tv_sec = lwm2m_gettime();
// initialize first 6 bytes, leave the last 2 random
temp_token[0] = mID;
temp_token[1] = mID >> 8;
temp_token[2] = tv_sec;
temp_token[3] = tv_sec >> 8;
temp_token[4] = tv_sec >> 16;
temp_token[5] = tv_sec >> 24;
// use just the provided amount of bytes
coap_set_header_token(transacP->message, temp_token, token_len);
}
}
LOG("Exiting on success");
return transacP;
error:
LOG("Exiting on failure");
lwm2m_free(transacP);
return NULL;
}
/* This function is an adaptation of function coap_receive() from Erbium's er-coap-13-engine.c.
* Erbium is Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
* All rights reserved.
*/
void lwm2m_handle_packet(lwm2m_context_t * contextP,
uint8_t * buffer,
int length,
void * fromSessionH)
{
uint8_t coap_error_code = NO_ERROR;
static coap_packet_t message[1];
static coap_packet_t response[1];
LOG("Entering");
coap_error_code = coap_parse_message(message, buffer, (uint16_t)length);
if (coap_error_code == NO_ERROR)
{
LOG_ARG("Parsed: ver %u, type %u, tkl %u, code %u.%.2u, mid %u, Content type: %d",
message->version, message->type, message->token_len, message->code >> 5, message->code & 0x1F, message->mid, message->content_type);
LOG_ARG("Payload: %.*s", message->payload_len, message->payload);
if (message->code >= COAP_GET && message->code <= COAP_DELETE)
{
uint32_t block_num = 0;
uint16_t block_size = REST_MAX_CHUNK_SIZE;
uint32_t block_offset = 0;
int64_t new_offset = 0;
/* prepare response */
if (message->type == COAP_TYPE_CON)
{
/* Reliable CON requests are answered with an ACK. */
coap_init_message(response, COAP_TYPE_ACK, COAP_205_CONTENT, message->mid);
}
else
{
/* Unreliable NON requests are answered with a NON as well. */
coap_init_message(response, COAP_TYPE_NON, COAP_205_CONTENT, contextP->nextMID++);
}
/* mirror token */
if (message->token_len)
{
coap_set_header_token(response, message->token, message->token_len);
}
/* get offset for blockwise transfers */
if (coap_get_header_block2(message, &block_num, NULL, &block_size, &block_offset))
{
LOG_ARG("Blockwise: block request %u (%u/%u) @ %u bytes", block_num, block_size, REST_MAX_CHUNK_SIZE, block_offset);
block_size = MIN(block_size, REST_MAX_CHUNK_SIZE);
new_offset = block_offset;
}
/* handle block1 option */
if (IS_OPTION(message, COAP_OPTION_BLOCK1))
{
#ifdef LWM2M_CLIENT_MODE
// get server
lwm2m_server_t * serverP;
serverP = utils_findServer(contextP, fromSessionH);
#ifdef LWM2M_BOOTSTRAP
if (serverP == NULL)
{
serverP = utils_findBootstrapServer(contextP, fromSessionH);
}
#endif
if (serverP == NULL)
{
coap_error_code = COAP_500_INTERNAL_SERVER_ERROR;
}
else
{
uint32_t block1_num;
uint8_t block1_more;
uint16_t block1_size;
uint8_t * complete_buffer = NULL;
size_t complete_buffer_size;
// parse block1 header
coap_get_header_block1(message, &block1_num, &block1_more, &block1_size, NULL);
LOG_ARG("Blockwise: block1 request NUM %u (SZX %u/ SZX Max%u) MORE %u", block1_num, block1_size, REST_MAX_CHUNK_SIZE, block1_more);
// handle block 1
coap_error_code = coap_block1_handler(&serverP->block1Data, message->mid, message->payload, message->payload_len, block1_size, block1_num, block1_more, &complete_buffer, &complete_buffer_size);
// if payload is complete, replace it in the coap message.
if (coap_error_code == NO_ERROR)
{
message->payload = complete_buffer;
message->payload_len = complete_buffer_size;
}
else if (coap_error_code == COAP_231_CONTINUE)
{
block1_size = MIN(block1_size, REST_MAX_CHUNK_SIZE);
coap_set_header_block1(response,block1_num, block1_more,block1_size);
}
}
#else
coap_error_code = COAP_501_NOT_IMPLEMENTED;
#endif
}
if (coap_error_code == NO_ERROR)
{
coap_error_code = handle_request(contextP, fromSessionH, message, response);
}
if (coap_error_code==NO_ERROR)
{
/* Save original payload pointer for later freeing. Payload in response may be updated. */
uint8_t *payload = response->payload;
if ( IS_OPTION(message, COAP_OPTION_BLOCK2) )
{
/* unchanged new_offset indicates that resource is unaware of blockwise transfer */
if (new_offset==block_offset)
{
LOG_ARG("Blockwise: unaware resource with payload length %u/%u", response->payload_len, block_size);
if (block_offset >= response->payload_len)
{
LOG("handle_incoming_data(): block_offset >= response->payload_len");
response->code = COAP_402_BAD_OPTION;
coap_set_payload(response, "BlockOutOfScope", 15); /* a const char str[] and sizeof(str) produces larger code size */
}
else
{
coap_set_header_block2(response, block_num, response->payload_len - block_offset > block_size, block_size);
coap_set_payload(response, response->payload+block_offset, MIN(response->payload_len - block_offset, block_size));
} /* if (valid offset) */
}
else
{
/* resource provides chunk-wise data */
LOG_ARG("Blockwise: blockwise resource, new offset %d", (int) new_offset);
coap_set_header_block2(response, block_num, new_offset!=-1 || response->payload_len > block_size, block_size);
if (response->payload_len > block_size) coap_set_payload(response, response->payload, block_size);
} /* if (resource aware of blockwise) */
}
else if (new_offset!=0)
{
LOG_ARG("Blockwise: no block option for blockwise resource, using block size %u", REST_MAX_CHUNK_SIZE);
coap_set_header_block2(response, 0, new_offset!=-1, REST_MAX_CHUNK_SIZE);
coap_set_payload(response, response->payload, MIN(response->payload_len, REST_MAX_CHUNK_SIZE));
} /* if (blockwise request) */
coap_error_code = message_send(contextP, response, fromSessionH);
lwm2m_free(payload);
response->payload = NULL;
response->payload_len = 0;
}
else if (coap_error_code != COAP_IGNORE)
{
if (1 == coap_set_status_code(response, coap_error_code))
{
coap_error_code = message_send(contextP, response, fromSessionH);
}
}
}
else
{
/* Responses */
switch (message->type)
{
case COAP_TYPE_NON:
case COAP_TYPE_CON:
{
bool done = transaction_handleResponse(contextP, fromSessionH, message, response);
#ifdef LWM2M_SERVER_MODE
if (!done && IS_OPTION(message, COAP_OPTION_OBSERVE) &&
((message->code == COAP_204_CHANGED) || (message->code == COAP_205_CONTENT)))
{
done = observe_handleNotify(contextP, fromSessionH, message, response);
}
#endif
if (!done && message->type == COAP_TYPE_CON )
{
coap_init_message(response, COAP_TYPE_ACK, 0, message->mid);
coap_error_code = message_send(contextP, response, fromSessionH);
}
}
break;
case COAP_TYPE_RST:
/* Cancel possible subscriptions. */
handle_reset(contextP, fromSessionH, message);
transaction_handleResponse(contextP, fromSessionH, message, NULL);
break;
case COAP_TYPE_ACK:
transaction_handleResponse(contextP, fromSessionH, message, NULL);
break;
default:
break;
}
} /* Request or Response */
coap_free_header(message);
} /* if (parsed correctly) */
// server CB
int request1 (void* transaction_, void* data) {
#if COAP_CEU
CEU_Transaction* transaction = (CEU_Transaction*) transaction_;
#else
coap_transaction_t* transaction = (coap_transaction_t*) transaction_;
#endif
/* Use transaction buffer for response to confirmable request. */
uint32_t block_num = 0;
uint16_t block_size = REST_MAX_CHUNK_SIZE;
uint32_t block_offset = 0;
int32_t new_offset = 0;
/* prepare response */
if (message->type==COAP_TYPE_CON)
{
/* Reliable CON requests are answered with an ACK. */
coap_init_message(response, COAP_TYPE_ACK, CONTENT_2_05, message->mid);
}
else
{
/* Unreliable NON requests are answered with a NON as well. */
coap_init_message(response, COAP_TYPE_NON, CONTENT_2_05, coap_get_mid());
}
/* mirror token */
if (message->token_len)
{
coap_set_header_token(response, message->token, message->token_len);
}
/* get offset for blockwise transfers */
if (coap_get_header_block2(message, &block_num, NULL, &block_size, &block_offset))
{
PRINTF("Blockwise: block request %lu (%u/%u) @ %lu bytes\n", block_num, block_size, REST_MAX_CHUNK_SIZE, block_offset);
block_size = MIN(block_size, REST_MAX_CHUNK_SIZE);
new_offset = block_offset;
}
/* Invoke resource handler. */
if (service_cbk)
{
/* Call REST framework and check if found and allowed. */
if (service_cbk(message, response, transaction->packet+COAP_MAX_HEADER_SIZE, block_size, &new_offset))
{
if (coap_error_code==NO_ERROR)
{
/* Apply blockwise transfers. */
if ( IS_OPTION(message, COAP_OPTION_BLOCK1) && response->code<BAD_REQUEST_4_00 && !IS_OPTION(response, COAP_OPTION_BLOCK1) )
{
PRINTF("Block1 NOT IMPLEMENTED\n");
coap_error_code = NOT_IMPLEMENTED_5_01;
coap_error_message = "NoBlock1Support";
}
else if ( IS_OPTION(message, COAP_OPTION_BLOCK2) )
{
/* unchanged new_offset indicates that resource is unaware of blockwise transfer */
if (new_offset==block_offset)
{
PRINTF("Blockwise: unaware resource with payload length %u/%u\n", response->payload_len, block_size);
if (block_offset >= response->payload_len)
{
PRINTF("handle_incoming_data(): block_offset >= response->payload_len\n");
response->code = BAD_OPTION_4_02;
coap_set_payload(response, "BlockOutOfScope", 15); /* a const char str[] and sizeof(str) produces larger code size */
}
else
{
coap_set_header_block2(response, block_num, response->payload_len - block_offset > block_size, block_size);
coap_set_payload(response, response->payload+block_offset, MIN(response->payload_len - block_offset, block_size));
} /* if (valid offset) */
}
else
{
/* resource provides chunk-wise data */
PRINTF("Blockwise: blockwise resource, new offset %ld\n", new_offset);
coap_set_header_block2(response, block_num, new_offset!=-1 || response->payload_len > block_size, block_size);
if (response->payload_len > block_size) coap_set_payload(response, response->payload, block_size);
} /* if (resource aware of blockwise) */
}
else if (new_offset!=0)
{
PRINTF("Blockwise: no block option for blockwise resource, using block size %u\n", REST_MAX_CHUNK_SIZE);
coap_set_header_block2(response, 0, new_offset!=-1, REST_MAX_CHUNK_SIZE);
coap_set_payload(response, response->payload, MIN(response->payload_len, REST_MAX_CHUNK_SIZE));
} /* if (blockwise request) */
} /* no errors/hooks */
} /* successful service callback */
/* Serialize response. */
if (coap_error_code==NO_ERROR)
{
if ((transaction->packet_len = coap_serialize_message(response, transaction->packet))==0)
{
coap_error_code = PACKET_SERIALIZATION_ERROR;
}
}
}
else
{
coap_error_code = NOT_IMPLEMENTED_5_01;
coap_error_message = "NoServiceCallbck"; // no a to fit 16 bytes
} /* if (service callback) */
return coap_error_code;
}
/* This function is an adaptation of function coap_receive() from Erbium's er-coap-13-engine.c.
* Erbium is Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
* All rights reserved.
*/
void lwm2m_handle_packet(lwm2m_context_t * contextP,
uint8_t * buffer,
int length,
void * fromSessionH)
{
coap_status_t coap_error_code = NO_ERROR;
static coap_packet_t message[1];
static coap_packet_t response[1];
coap_error_code = coap_parse_message(message, buffer, (uint16_t)length);
if (message[0].uri_path && message[0].uri_path->next &&
(message[0].uri_path->next->is_static != 0 && message[0].uri_path->next->is_static != 1)) {
printf("BLA\n");
}
if (coap_error_code == NO_ERROR)
{
LOG(" Parsed: ver %u, type %u, tkl %u, code %u.%.2u, mid %u\r\n", message->version, message->type, message->token_len, message->code >> 5, message->code & 0x1F, message->mid);
LOG(" Content type: %d\r\n Payload: %.*s\r\n\n", message->content_type, message->payload_len, message->payload);
if (message->code >= COAP_GET && message->code <= COAP_DELETE)
{
uint32_t block_num = 0;
uint16_t block_size = REST_MAX_CHUNK_SIZE;
uint32_t block_offset = 0;
int64_t new_offset = 0;
/* prepare response */
if (message->type == COAP_TYPE_CON)
{
/* Reliable CON requests are answered with an ACK. */
coap_init_message(response, COAP_TYPE_ACK, COAP_205_CONTENT, message->mid);
}
else
{
/* Unreliable NON requests are answered with a NON as well. */
coap_init_message(response, COAP_TYPE_NON, COAP_205_CONTENT, contextP->nextMID++);
}
/* mirror token */
if (message->token_len)
{
coap_set_header_token(response, message->token, message->token_len);
}
/* get offset for blockwise transfers */
if (coap_get_header_block2(message, &block_num, NULL, &block_size, &block_offset))
{
LOG("Blockwise: block request %u (%u/%u) @ %u bytes\n", block_num, block_size, REST_MAX_CHUNK_SIZE, block_offset);
block_size = MIN(block_size, REST_MAX_CHUNK_SIZE);
new_offset = block_offset;
}
coap_error_code = handle_request(contextP, fromSessionH, message, response);
if (coap_error_code==NO_ERROR)
{
/* Apply blockwise transfers. */
if ( IS_OPTION(message, COAP_OPTION_BLOCK1) && response->code<COAP_400_BAD_REQUEST && !IS_OPTION(response, COAP_OPTION_BLOCK1) )
{
LOG("Block1 NOT IMPLEMENTED\n");
coap_error_code = COAP_501_NOT_IMPLEMENTED;
coap_error_message = "NoBlock1Support";
}
else if ( IS_OPTION(message, COAP_OPTION_BLOCK2) )
{
/* unchanged new_offset indicates that resource is unaware of blockwise transfer */
if (new_offset==block_offset)
{
LOG("Blockwise: unaware resource with payload length %u/%u\n", response->payload_len, block_size);
if (block_offset >= response->payload_len)
{
LOG("handle_incoming_data(): block_offset >= response->payload_len\n");
response->code = COAP_402_BAD_OPTION;
coap_set_payload(response, "BlockOutOfScope", 15); /* a const char str[] and sizeof(str) produces larger code size */
}
else
{
coap_set_header_block2(response, block_num, response->payload_len - block_offset > block_size, block_size);
coap_set_payload(response, response->payload+block_offset, MIN(response->payload_len - block_offset, block_size));
} /* if (valid offset) */
}
else
{
/* resource provides chunk-wise data */
LOG("Blockwise: blockwise resource, new offset %d\n", (int) new_offset);
coap_set_header_block2(response, block_num, new_offset!=-1 || response->payload_len > block_size, block_size);
if (response->payload_len > block_size) coap_set_payload(response, response->payload, block_size);
} /* if (resource aware of blockwise) */
}
else if (new_offset!=0)
{
LOG("Blockwise: no block option for blockwise resource, using block size %u\n", REST_MAX_CHUNK_SIZE);
coap_set_header_block2(response, 0, new_offset!=-1, REST_MAX_CHUNK_SIZE);
coap_set_payload(response, response->payload, MIN(response->payload_len, REST_MAX_CHUNK_SIZE));
} /* if (blockwise request) */
coap_error_code = message_send(contextP, response, fromSessionH);
lwm2m_free(response->payload);
response->payload = NULL;
response->payload_len = 0;
}
else if (coap_error_code != COAP_IGNORE)
{
if (1 == coap_set_status_code(response, coap_error_code))
{
coap_error_code = message_send(contextP, response, fromSessionH);
}
}
}
else
{
/* Responses */
switch (message->type)
{
case COAP_TYPE_NON:
case COAP_TYPE_CON:
{
bool done = transaction_handleResponse(contextP, fromSessionH, message, response);
#ifdef LWM2M_SERVER_MODE
if (!done && IS_OPTION(message, COAP_OPTION_OBSERVE) &&
((message->code == COAP_204_CHANGED) || (message->code == COAP_205_CONTENT)))
{
done = observe_handleNotify(contextP, fromSessionH, message, response);
}
#endif
if (!done && message->type == COAP_TYPE_CON )
{
coap_init_message(response, COAP_TYPE_ACK, 0, message->mid);
coap_error_code = message_send(contextP, response, fromSessionH);
}
}
break;
case COAP_TYPE_RST:
/* Cancel possible subscriptions. */
handle_reset(contextP, fromSessionH, message);
transaction_handleResponse(contextP, fromSessionH, message, NULL);
break;
case COAP_TYPE_ACK:
transaction_handleResponse(contextP, fromSessionH, message, NULL);
break;
default:
break;
}
} /* Request or Response */
coap_free_header(message);
} /* if (parsed correctly) */
/*-----------------------------------------------------------------------------------*/
static
int
handle_incoming_data(void)
{
int error = NO_ERROR;
PRINTF("handle_incoming_data(): received uip_datalen=%u \n",(uint16_t)uip_datalen());
if (uip_newdata()) {
PRINTF("receiving UDP datagram from: ");
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
PRINTF(":%u\n Length: %u\n Data: ", uip_ntohs(UIP_UDP_BUF->srcport), uip_datalen() );
PRINTBITS(uip_appdata, uip_datalen());
PRINTF("\n");
coap_packet_t message[1];
coap_transaction_t *transaction = NULL;
error = coap_parse_message(message, uip_appdata, uip_datalen());
if (error==NO_ERROR)
{
/*TODO duplicates suppression, if required */
PRINTF(" Parsed: v %u, t %u, oc %u, c %u, tid %u\n", message->version, message->type, message->option_count, message->code, message->tid);
PRINTF(" URL: %.*s\n", message->uri_path_len, message->uri_path);
PRINTF(" Payload: %.*s\n", message->payload_len, message->payload);
/* Handle requests. */
if (message->code >= COAP_GET && message->code <= COAP_DELETE)
{
/* Use transaction buffer for response to confirmable request. */
if ( (transaction = coap_new_transaction(message->tid, &UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport)) )
{
uint32_t block_num = 0;
uint16_t block_size = REST_MAX_CHUNK_SIZE;
uint32_t block_offset = 0;
int32_t new_offset = 0;
/* prepare response */
coap_packet_t response[1]; /* This way the packet can be treated as pointer as usual. */
if (message->type==COAP_TYPE_CON)
{
/* Reliable CON requests are answered with an ACK. */
coap_init_message(response, COAP_TYPE_ACK, OK_200, message->tid);
}
else
{
/* Unreliable NON requests are answered with a NON as well. */
coap_init_message(response, COAP_TYPE_NON, OK_200, coap_get_tid());
}
/* resource handlers must take care of different handling (e.g., TOKEN_OPTION_REQUIRED_240) */
if (IS_OPTION(message, COAP_OPTION_TOKEN))
{
coap_set_header_token(response, message->token, message->token_len);
SET_OPTION(response, COAP_OPTION_TOKEN);
}
/* get offset for blockwise transfers */
if (coap_get_header_block(message, &block_num, NULL, &block_size, &block_offset))
{
PRINTF("Blockwise: block request %lu (%u/%u) @ %lu bytes\n", block_num, block_size, REST_MAX_CHUNK_SIZE, block_offset);
block_size = MIN(block_size, REST_MAX_CHUNK_SIZE);
new_offset = block_offset;
}
/*------------------------------------------*/
/* call application-specific handler */
/*------------------------------------------*/
if (service_cbk) {
service_cbk(message, response, transaction->packet+COAP_MAX_HEADER_SIZE, block_size, &new_offset);
}
/*------------------------------------------*/
/* apply blockwise transfers */
if ( IS_OPTION(message, COAP_OPTION_BLOCK) )
{
/* unchanged new_offset indicates that resource is unaware of blockwise transfer */
if (new_offset==block_offset)
{
PRINTF("Blockwise: unaware resource with payload length %u/%u\n", response->payload_len, block_size);
if (block_offset >= response->payload_len)
{
response->code = BAD_REQUEST_400;
coap_set_payload(response, (uint8_t*)"Block out of scope", 18);
}
else
{
coap_set_header_block(response, block_num, response->payload_len - block_offset > block_size, block_size);
coap_set_payload(response, response->payload+block_offset, MIN(response->payload_len - block_offset, block_size));
} /* if (valid offset) */
}
else
{
/* resource provides chunk-wise data */
PRINTF("Blockwise: blockwise resource, new offset %ld\n", new_offset);
coap_set_header_block(response, block_num, new_offset!=-1 || response->payload_len > block_size, block_size);
if (response->payload_len > block_size) coap_set_payload(response, response->payload, block_size);
} /* if (resource aware of blockwise) */
}
else if (new_offset!=0)
{
PRINTF("Blockwise: no block option for blockwise resource, using block size %u\n", REST_MAX_CHUNK_SIZE);
coap_set_header_block(response, 0, new_offset!=-1, REST_MAX_CHUNK_SIZE);
coap_set_payload(response, response->payload, MIN(response->payload_len, REST_MAX_CHUNK_SIZE));
} /* if (blockwise request) */
if ((transaction->packet_len = coap_serialize_message(response, transaction->packet))==0)
{
error = PACKET_SERIALIZATION_ERROR;
}
} else {
error = MEMORY_ALLOCATION_ERROR;
}
}
else
{
/* Responses */
coap_transaction_t *t;
if (message->type==COAP_TYPE_ACK)
{
PRINTF("Received ACK\n");
}
else if (message->type==COAP_TYPE_RST)
{
PRINTF("Received RST\n");
/* Cancel possible subscriptions. */
if (IS_OPTION(message, COAP_OPTION_TOKEN))
{
PRINTF(" Token 0x%02X%02X\n", message->token[0], message->token[1]);
coap_remove_observer_by_token(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport, message->token, message->token_len);
}
}
if ( (t = coap_get_transaction_by_tid(message->tid)) )
{
/* Free transaction memory before callback, as it may create a new transaction. */
restful_response_handler callback = t->callback;
void *callback_data = t->callback_data;
coap_clear_transaction(t);
/* Check if someone registered for the response */
if (callback) {
callback(callback_data, message);
}
} /* if (transaction) */
}
} /* if (parsed correctly) */
if (error==NO_ERROR) {
if (transaction) coap_send_transaction(transaction);
}
else
{
PRINTF("ERROR %u: %s\n", error, error_messages[error]);
/* reuse input buffer */
coap_init_message(message, COAP_TYPE_ACK, INTERNAL_SERVER_ERROR_500, message->tid);
coap_set_payload(message, (uint8_t *) error_messages[error], strlen(error_messages[error]));
coap_send_message(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport, uip_appdata, coap_serialize_message(message, uip_appdata));
}
} /* if (new data) */
return error;
}
