// ATT Client Read Callback for Dynamic Data
// - if buffer == NULL, don't copy data, just return size of value
// - if buffer != NULL, copy data and return number bytes copied
// @param offset defines start of attribute value
static uint16_t att_read_callback(uint16_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){
printf("READ Callback, handle %04x, offset %u, buffer size %u\n", handle, offset, buffer_size);
uint16_t att_value_len;
uint16_t uuid16 = att_uuid_for_handle(handle);
switch (uuid16){
case 0x2902:
if (buffer) {
buffer[0] = client_configuration;
}
return 1;
case 0x2a00:
att_value_len = strlen(gap_device_name);
if (buffer) {
memcpy(buffer, gap_device_name, att_value_len);
}
return att_value_len;
case 0x2a01:
if (buffer){
bt_store_16(buffer, 0, gap_appearance);
}
return 2;
case 0x2a02:
if (buffer){
buffer[0] = gap_privacy;
}
return 1;
case 0x2A03:
if (buffer) {
bt_flip_addr(buffer, gap_reconnection_address);
}
return 6;
// handle device name
// handle appearance
default:
break;
}
// find attribute
int index = att_attribute_for_handle(handle);
uint8_t * att_value;
if (index < 0){
// not written before
if (att_default_value_long){
att_value = (uint8_t*) default_value_long;
att_value_len = strlen(default_value_long);
} else {
att_value = (uint8_t*) default_value_short;
att_value_len = strlen(default_value_short);
}
} else {
att_value = att_attributes[index].value;
att_value_len = att_attributes[index].len;
}
printf("Attribute len %u, data: ", att_value_len);
printf_hexdump(att_value, att_value_len);
// assert offset <= att_value_len
if (offset > att_value_len) {
return 0;
}
uint16_t bytes_to_copy = att_value_len - offset;
if (!buffer) return bytes_to_copy;
if (bytes_to_copy > buffer_size){
bytes_to_copy = buffer_size;
}
memcpy(buffer, &att_value[offset], bytes_to_copy);
return bytes_to_copy;
}
// write requests
static int att_write_callback(uint16_t con_handle, uint16_t attribute_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){
printf("WRITE Callback, handle %04x, mode %u, offset %u, data: ", handle, transaction_mode, offset);
printf_hexdump(buffer, buffer_size);
uint16_t uuid16 = att_uuid_for_handle(handle);
switch (uuid16){
case 0x2902:
client_configuration = buffer[0];
client_configuration_handle = handle;
printf("Client Configuration set to %u for handle %04x\n", client_configuration, handle);
return 0; // ok
case 0x2a00:
memcpy(gap_device_name, buffer, buffer_size);
gap_device_name[buffer_size]=0;
printf("Setting device name to '%s'\n", gap_device_name);
return 0;
case 0x2a01:
gap_appearance = READ_BT_16(buffer, 0);
printf("Setting appearance to 0x%04x'\n", gap_appearance);
return 0;
case 0x2a02:
gap_privacy = buffer[0];
printf("Setting privacy to 0x%04x'\n", gap_privacy);
update_advertisements();
return 0;
case 0x2A03:
bt_flip_addr(gap_reconnection_address, buffer);
printf("Setting Reconnection Address to %s\n", bd_addr_to_str(gap_reconnection_address));
return 0;
// handle device name
// handle appearance
}
// check transaction mode
int attributes_index;
int writes_index;
switch (transaction_mode){
case ATT_TRANSACTION_MODE_NONE:
attributes_index = att_attribute_for_handle(handle);
if (attributes_index < 0){
attributes_index = att_attribute_for_handle(0);
if (attributes_index < 0) return 0; // ok, but we couldn't store it (our fault)
att_attributes[attributes_index].handle = handle;
// not written before
uint8_t * att_value;
uint16_t att_value_len;
if (att_default_value_long){
att_value = (uint8_t*) default_value_long;
att_value_len = strlen(default_value_long);
} else {
att_value = (uint8_t*) default_value_short;
att_value_len = strlen(default_value_short);
}
att_attributes[attributes_index].len = att_value_len;
}
if (buffer_size > att_attributes[attributes_index].len) return ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH;
att_attributes[attributes_index].len = buffer_size;
memcpy(att_attributes[attributes_index].value, buffer, buffer_size);
break;
case ATT_TRANSACTION_MODE_ACTIVE:
writes_index = att_write_queue_for_handle(handle);
if (writes_index < 0) return ATT_ERROR_PREPARE_QUEUE_FULL;
if (offset > att_write_queues[writes_index].len) return ATT_ERROR_INVALID_OFFSET;
if (buffer_size + offset > ATT_VALUE_MAX_LEN) return ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH;
att_write_queues[writes_index].len = buffer_size + offset;
memcpy(&(att_write_queues[writes_index].value[offset]), buffer, buffer_size);
break;
case ATT_TRANSACTION_MODE_EXECUTE:
for (writes_index=0 ; writes_index<ATT_NUM_WRITE_QUEUES ; writes_index++){
handle = att_write_queues[writes_index].handle;
if (handle == 0) continue;
attributes_index = att_attribute_for_handle(handle);
if (attributes_index < 0){
attributes_index = att_attribute_for_handle(0);
if (attributes_index < 0) continue;
att_attributes[attributes_index].handle = handle;
}
att_attributes[attributes_index].len = att_write_queues[writes_index].len;
memcpy(att_attributes[attributes_index].value, att_write_queues[writes_index].value, att_write_queues[writes_index].len);
}
att_write_queue_init();
break;
case ATT_TRANSACTION_MODE_CANCEL:
att_write_queue_init();
break;
}
return 0;
}
// ATT Client Read Callback for Dynamic Data
// - if buffer == NULL, don't copy data, just return size of value
// - if buffer != NULL, copy data and return number bytes copied
// @param offset defines start of attribute value
static uint16_t att_read_callback(uint16_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){
printf("READ Callback, handle %04x, offset %u, buffer size %u\n", attribute_handle, offset, buffer_size);
uint16_t att_value_len;
switch (attribute_handle){
case ATT_CHARACTERISTIC_GAP_DEVICE_NAME_01_VALUE_HANDLE:
att_value_len = strlen(gap_device_name);
if (buffer) {
memcpy(buffer, gap_device_name, att_value_len);
}
return att_value_len;
case ATT_CHARACTERISTIC_GAP_APPEARANCE_01_VALUE_HANDLE:
if (buffer){
bt_store_16(buffer, 0, gap_appearance);
}
return 2;
case ATT_CHARACTERISTIC_GAP_PERIPHERAL_PRIVACY_FLAG_01_VALUE_HANDLE:
if (buffer){
buffer[0] = gap_privacy;
}
return 1;
case ATT_CHARACTERISTIC_GAP_RECONNECTION_ADDRESS_01_VALUE_HANDLE:
if (buffer) {
bt_flip_addr(buffer, gap_reconnection_address);
}
return 6;
default:
break;
}
uint16_t uuid16 = att_uuid_for_handle(handle);
if (uuid16){
printf("Resolved to UUID %04x\n", uuid16);
switch (uuid16){
case 0x2902:
if (buffer) {
buffer[0] = client_configuration;
}
return 1;
default:
break;
}
}
// find attribute
int index = att_attribute_for_handle(handle);
uint8_t * att_value;
if (index < 0){
// not written before
if (att_default_value_long){
att_value = (uint8_t*) default_value_long;
att_value_len = strlen(default_value_long);
} else {
att_value = (uint8_t*) default_value_short;
att_value_len = strlen(default_value_short);
}
} else {
att_value = att_attributes[index].value;
att_value_len = att_attributes[index].len;
}
printf("Attribute len %u, data: ", att_value_len);
printf_hexdump(att_value, att_value_len);
// assert offset <= att_value_len
if (offset > att_value_len) {
return 0;
}
uint16_t bytes_to_copy = att_value_len - offset;
if (!buffer) return bytes_to_copy;
if (bytes_to_copy > buffer_size){
bytes_to_copy = buffer_size;
}
memcpy(buffer, &att_value[offset], bytes_to_copy);
return bytes_to_copy;
}
