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gatt_client: Adds configuration for when or if a MTU negotiation should be made.

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- Disable automatic MTU negotiation for gatt_client. Add method to manually
  send a MTU negotiation
This commit is contained in:
Jakob Krantz 2018-01-25 18:37:02 +01:00 committed by Matthias Ringwald
parent b12646c53b
commit 5cf6c43447
2 changed files with 35 additions and 4 deletions
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26
src/ble/gatt_client.c
View File

@ -67,6 +67,8 @@ static btstack_linked_list_t gatt_client_value_listeners;
static btstack_packet_callback_registration_t hci_event_callback_registration;
static uint8_t pts_suppress_mtu_exchange;
static uint8_t mtu_exchange_enabled;
static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size);
static void gatt_client_hci_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void gatt_client_report_error_if_pending(gatt_client_t *peripheral, uint8_t error_code);
@ -86,7 +88,7 @@ static uint16_t peripheral_mtu(gatt_client_t *peripheral){
void gatt_client_init(void){
gatt_client_connections = NULL;
pts_suppress_mtu_exchange = 0;
mtu_exchange_enabled = 1;
// regsister for HCI Events
hci_event_callback_registration.callback = &gatt_client_hci_event_packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
@ -151,7 +153,11 @@ static gatt_client_t * provide_context_for_conn_handle(hci_con_handle_t con_hand
memset(context, 0, sizeof(gatt_client_t));
context->con_handle = con_handle;
context->mtu = ATT_DEFAULT_MTU;
context->mtu_state = SEND_MTU_EXCHANGE;
if (mtu_exchange_enabled){
context->mtu_state = SEND_MTU_EXCHANGE;
} else {
context->mtu_state = MTU_AUTO_EXCHANGE_DISABLED;
}
context->gatt_client_state = P_READY;
btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)context);
@ -179,9 +185,13 @@ int gatt_client_is_ready(hci_con_handle_t con_handle){
return is_ready(context);
}
void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){
mtu_exchange_enabled = enabled;
}
uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){
gatt_client_t * context = provide_context_for_conn_handle(con_handle);
if (context && context->mtu_state == MTU_EXCHANGED){
if (context && (context->mtu_state == MTU_EXCHANGED || context->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){
*mtu = context->mtu;
return 0;
}
@ -1900,3 +1910,13 @@ void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, i
descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0);
}
}
void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){
gatt_client_t * context = provide_context_for_conn_handle(con_handle);
if (!context) return;
if (context->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){
context->callback = callback;
context->mtu_state = SEND_MTU_EXCHANGE;
gatt_client_run();
}
}

13
src/ble/gatt_client.h
View File

@ -126,7 +126,8 @@ typedef enum {
typedef enum{
SEND_MTU_EXCHANGE,
SENT_MTU_EXCHANGE,
MTU_EXCHANGED
MTU_EXCHANGED,
MTU_AUTO_EXCHANGE_DISABLED
} gatt_client_mtu_t;
typedef struct gatt_client{
@ -218,6 +219,16 @@ void gatt_client_init(void);
*/
uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu);
/**
* @brief Sets whether a MTU Exchange Request shall be automatically send before the first attribute read request is send.
*/
void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled);
/**
* @brief Sends a MTU Exchange Request, this allows for the client to exchange MTU when gatt_client_mtu_enable_auto_negotiation is disabled.
*/
void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle);
/**
* @brief Returns if the GATT client is ready to receive a query. It is used with daemon.
*/