/* Only GET method allowed */
static uint8_t door_trip_resource_cb(sn_coap_hdr_s *received_coap_ptr, sn_nsdl_addr_s *address, sn_proto_info_s * proto)
{
sn_coap_hdr_s *coap_res_ptr = 0;
snprintf(door_trip_val,2,"%d" ,current_door_trip_value);
pc.printf("door_trip callback\r\n");
pc.printf("door_trip: %s\r\n", door_trip_val);
if(received_coap_ptr->msg_code == COAP_MSG_CODE_REQUEST_GET)
{
coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CONTENT);
coap_res_ptr->payload_len = strlen(door_trip_val);
coap_res_ptr->payload_ptr = (uint8_t*)door_trip_val;
coap_res_ptr->content_type_ptr = &content_type;
coap_res_ptr->content_type_len = sizeof(content_type);
if(received_coap_ptr->token_ptr){
pc.printf(" Token included\r\n");
if(obs_token_ptr)
{
free(obs_token_ptr);
obs_token_ptr = 0;
}
obs_token_ptr = (uint8_t*)malloc(received_coap_ptr->token_len);
if(obs_token_ptr){
memcpy(obs_token_ptr, received_coap_ptr->token_ptr, received_coap_ptr->token_len);
obs_token_len = received_coap_ptr->token_len;
}
}
if(received_coap_ptr->options_list_ptr->observe){
coap_res_ptr->options_list_ptr = (sn_coap_options_list_s*)malloc(sizeof(sn_coap_options_list_s));
memset(coap_res_ptr->options_list_ptr, 0, sizeof(sn_coap_options_list_s));
coap_res_ptr->options_list_ptr->observe_ptr = &obs_number;
coap_res_ptr->options_list_ptr->observe_len = 1;
obs_number++;
}
pc.printf(" Send observation %d... \r\n", obs_number);
sn_nsdl_send_coap_message(address, coap_res_ptr);
nsdl_free(coap_res_ptr->options_list_ptr);
coap_res_ptr->options_list_ptr = NULL;
coap_res_ptr->content_type_ptr = NULL;// parser_release below tries to free this memory
}
sn_coap_parser_release_allocated_coap_msg_mem(coap_res_ptr);
return 0;
}
/*
Callback for LWM2M (CoAP REST) operations allowed on the resosurce
GET and PUT methods allowed
*/
static uint8_t LWM2M_resource_cb(sn_coap_hdr_s *received_coap_ptr, sn_nsdl_addr_s *address, sn_proto_info_s * proto)
{
sn_coap_hdr_s *coap_res_ptr = 0;
if(COAP_MSG_CODE_REQUEST_GET == received_coap_ptr->msg_code){
coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CONTENT);
current_sample = LWM2M_Sensor.read() * (float) 100;
sprintf(LWM2M_value_string,"%3.1f", current_sample);
pc.printf("LWM2M resource callback\r\n");
pc.printf("LWM2M resource state %s\r\n", LWM2M_value_string);
coap_res_ptr->payload_len = strlen(LWM2M_value_string);
coap_res_ptr->payload_ptr = (uint8_t*)LWM2M_value_string;
coap_res_ptr->content_type_ptr = &LWM2M_content_type;
coap_res_ptr->content_type_len = sizeof(LWM2M_content_type);
coap_res_ptr->options_list_ptr = (sn_coap_options_list_s*)nsdl_alloc(sizeof(sn_coap_options_list_s));
if(!coap_res_ptr->options_list_ptr){
pc.printf("cant alloc option list\r\n");
coap_res_ptr->options_list_ptr = NULL; //FIXME report error and recover
}
else{
memset(coap_res_ptr->options_list_ptr, 0, sizeof(sn_coap_options_list_s));
coap_res_ptr->options_list_ptr->max_age_ptr = &LWM2M_max_age;
coap_res_ptr->options_list_ptr->max_age_len = sizeof(LWM2M_max_age);
}
if(received_coap_ptr->token_ptr){
pc.printf("Token included\r\n");
// replace any existing token
if(LWM2M_obs_token_ptr){
free(LWM2M_obs_token_ptr);
LWM2M_obs_token_ptr = 0;
}
//with new token
LWM2M_obs_token_ptr = (uint8_t*)malloc(received_coap_ptr->token_len);
if(LWM2M_obs_token_ptr){
memcpy(LWM2M_obs_token_ptr, received_coap_ptr->token_ptr, received_coap_ptr->token_len);
LWM2M_obs_token_len = received_coap_ptr->token_len;
}
}
if(received_coap_ptr->options_list_ptr->observe) {
// get observe start/stop value from received GET
LWM2M_obs_option = * received_coap_ptr->options_list_ptr->observe_ptr;
// start or stop based on option value
// ref. draft-ietf-core-observe-16
if (START_OBS == LWM2M_obs_option){
coap_res_ptr->options_list_ptr->observe_ptr = &LWM2M_obs_number;
coap_res_ptr->options_list_ptr->observe_len = sizeof(LWM2M_obs_number);
LWM2M_start_notification();
}
else if (STOP_OBS == LWM2M_obs_option){
LWM2M_stop_notification();
}
}
sn_nsdl_send_coap_message(address, coap_res_ptr);
nsdl_free(coap_res_ptr->options_list_ptr);
coap_res_ptr->options_list_ptr = NULL;
coap_res_ptr->content_type_ptr = NULL;// parser_release below tries to free this memory
}
/*
PUT needs to be enabled for the write attributes operation which is empty payload + query options
*/
else if(COAP_MSG_CODE_REQUEST_PUT == received_coap_ptr->msg_code){
//pc.printf("PUT: %d bytes\r\n", received_coap_ptr->payload_len);
if((received_coap_ptr->payload_len > 0) && (received_coap_ptr->payload_len <= 5)){
memcpy(LWM2M_update_string, (char *)received_coap_ptr->payload_ptr, received_coap_ptr->payload_len);
LWM2M_update_string[received_coap_ptr->payload_len] = '\0';
pc.printf("PUT: %s\r\n", LWM2M_update_string);
sscanf( LWM2M_update_string, "%f3.1", ¤t_sample); //update for read-back test, observe will clobber
coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CHANGED);
sn_nsdl_send_coap_message(address, coap_res_ptr);
}
// see if there are query options and scan for write attributes, allow payload and query options
// PUT without query ffrom web client reads some query string, wireshark it...
if(received_coap_ptr->options_list_ptr->uri_query_ptr != NULL){
LWM2M_query_string_ptr = (char*)nsdl_alloc(received_coap_ptr->options_list_ptr->uri_query_len+1);
if (LWM2M_query_string_ptr){
memcpy(LWM2M_query_string_ptr,
received_coap_ptr->options_list_ptr->uri_query_ptr,
received_coap_ptr->options_list_ptr->uri_query_len);
memset(LWM2M_query_string_ptr + received_coap_ptr->options_list_ptr->uri_query_len,'\0',1);//string terminator
// diagnostic
// pc.printf("query string received: %s\r\n", LWM2M_query_string_ptr);
attribute_update = false;
// extract query options from string
query_option = strtok(LWM2M_query_string_ptr, "&");// split the string
num_options = 0;
while (query_option != NULL){
strcpy(query_options[num_options++], query_option);
// pc.printf("query part: %s\r\n", query_option);
query_option = strtok(NULL, "&");// next query option
}
// pc.printf("setting attributes\r\n");
for (int option = 0; option < num_options; option++)
set_notification_attribute(query_options[option]);
nsdl_free(LWM2M_query_string_ptr);
// if anything was updated, re-initialize the stored notification attributes
if (attribute_update){
// initializes and sends an update if observing is on, don't change observing state
// allows cancel to turn off observing and updte state without sending a notification
LWM2M_notification_init();
coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CHANGED); // 2.04
}
else
// if query options are sent but no notification attribute names were found, it's an error
coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_BAD_REQUEST);// 4.00
sn_nsdl_send_coap_message(address, coap_res_ptr);
}
else
pc.printf("cant alloc query string\r\n");
}
}
sn_coap_parser_release_allocated_coap_msg_mem(coap_res_ptr);
return 0;
}