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gatt client: added MTU getter

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This commit is contained in:
mila@ringwald.ch 2015-02-05 14:34:03 +00:00
parent 507d06b870
commit 2a9ce0dec0
2 changed files with 26 additions and 7 deletions
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28
ble/gatt_client.c
View File

@ -201,6 +201,16 @@ int gatt_client_is_ready(uint16_t handle){
return is_ready(context);
}
le_command_status_t gatt_client_get_mtu(uint16_t handle, uint16_t * mtu){
gatt_client_t * context = provide_context_for_conn_handle(handle);
if (context && context->mtu_state == MTU_EXCHANGED){
*mtu = context->mtu;
return BLE_PERIPHERAL_OK;
}
*mtu = ATT_DEFAULT_MTU;
return BLE_PERIPHERAL_IN_WRONG_STATE;
}
// precondition: can_send_packet_now == TRUE
static void att_confirmation(uint16_t peripheral_handle){
l2cap_reserve_packet_buffer();
@ -312,6 +322,15 @@ static void att_prepare_write_request(uint16_t request_type, uint16_t peripheral
l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 5+blob_length);
}
static void att_exchange_mtu_request(uint16_t peripheral_handle){
uint16_t mtu = l2cap_max_le_mtu();
l2cap_reserve_packet_buffer();
uint8_t * request = l2cap_get_outgoing_buffer();
request[0] = ATT_EXCHANGE_MTU_REQUEST;
bt_store_16(request, 1, mtu);
l2cap_send_prepared_connectionless(peripheral_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3);
}
static uint16_t write_blob_length(gatt_client_t * peripheral){
uint16_t max_blob_length = peripheral_mtu(peripheral) - 5;
if (peripheral->attribute_offset >= peripheral->attribute_length) {
@ -686,13 +705,7 @@ static void gatt_client_run(){
switch (peripheral->mtu_state) {
case SEND_MTU_EXCHANGE:{
peripheral->mtu_state = SENT_MTU_EXCHANGE;
uint16_t mtu = l2cap_max_le_mtu();
// TODO: extract as att_exchange_mtu_request
l2cap_reserve_packet_buffer();
uint8_t * request = l2cap_get_outgoing_buffer();
request[0] = ATT_EXCHANGE_MTU_REQUEST;
bt_store_16(request, 1, mtu);
l2cap_send_prepared_connectionless(peripheral->handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, 3);
att_exchange_mtu_request(peripheral->handle);
return;
}
case SENT_MTU_EXCHANGE:
@ -892,6 +905,7 @@ static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle,
uint16_t local_rx_mtu = l2cap_max_le_mtu();
peripheral->mtu = remote_rx_mtu < local_rx_mtu ? remote_rx_mtu : local_rx_mtu;
peripheral->mtu_state = MTU_EXCHANGED;
break;
}
case ATT_READ_BY_GROUP_TYPE_RESPONSE:

5
ble/gatt_client.h
View File

@ -237,6 +237,11 @@ uint16_t gatt_client_register_packet_handler (gatt_client_callback_t callback);
// Unregister callback (packet handler) for gatt client.
void gatt_client_unregister_packet_handler(uint16_t gatt_client_id);
// MTU is available after the first query has completed.
// If status is equal to BLE_PERIPHERAL_OK, it returns the real value
// otherwise the default value of 23.
le_command_status_t gatt_client_get_mtu(uint16_t handle, uint16_t * mtu);
// Returns the GATT client context for the specified handle.
// gatt_client_t * get_gatt_client_context_for_handle(uint16_t con_handle);