gatt_client: allow Write Without Response independent of other requests

gatt_client: return ERROR_CODE_SUCCESS as status instead of 0, pass return value of l2cap_send_prepared_connectionless

gatt client: MISRA check for callback == NULL, return ERROR_CODE_SUCCESS instead of 0 for status

gat_client: rename status to att_status in GATT_EVENT_QUERY_COMPLETE event, add and use ATT_ERROR_SUCCESS instead of 0 status code

gatt_client: add missing {} to error handing with ENABLE_GATT_CLIENT_PAIRING

Use BTSTACK_FILE__ without __ prefix (MISRAC2012-Rule-21.1)

gatt_client: emit query complete for signed write

gatt_client: wait until identity resolving complete for signed write, emit GATT_EVENT_QUERY_COMPLETE with ATT_ERROR_BONDING_INFORMATION_MISSING if not bonding information is available

remove explicit memset call for buffers from btstack_memory

cleanup: remove unused std libs

gatt_client: stop timer on disconnect - fixes use after free / crash

gatt_client: ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY use ATT Find Information instead of Read By Type

gatt_client: if ENABLE_GATT_CLIENT_PAIRING, GATT Client starts pairing and retry operation on security error

gatt_client: wait until central re-encryption is complete

gatt_client: remove inline attribute from small functions that cause compiler warning about inlining being inefficient

gatt_client: fix handling of ATT_EVENT_MTU_EXCHANGE_COMPLETE

gatt_client: check if hci connection for given con handle exists

gatt_client: add gatt_client_request_can_write_without_response_event()

gatt_client: requeue gatt client after send for fairness

gatt_client: extract gatt_client_run_for_peripheral, don't abort gatt_client_run if one gatt client is in SENT_MTU_EXCHANGE state, request can_send_now when sending any packet

gatt_client: drop gatt_client_pts_suppress_mtu_exchange function, replaced by gatt_client_mtu_enable_auto_negotiation(0)

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

- Disable automatic MTU negotiation for gatt_client. Add method to manually
send a MTU negotiation

att_dispatch: Propogate MTU update to both att_server and gatt_client.

According to the BT 5.0 spec. A MTU negotiation shall only be required in one
direction. I.e. We must propogate the negotiated

att_dispatch: Propogate MTU update to both att_server and gatt_client.

According to the BT 5.0 spec. A MTU negotiation shall only be required in one
direction. I.e. We must propogate the negotiated MTU between gatt_client
and att_server.

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Adds missing emit of GATT_EVENT_MTU when the MTU has changed.

Fixes bug where the descriptor UUID16 was not set even thought it had one.

When deserializeing a characteristic_descriptor the UUID16 wouldn't be set even
thought it had an 16 bit UUID. This adds ch

Fixes bug where the descriptor UUID16 was not set even thought it had one.

When deserializeing a characteristic_descriptor the UUID16 wouldn't be set even
thought it had an 16 bit UUID. This adds check to see if the descriptor has a
UUID16, if so, we read the UUID16 and set it to the gatt_client_characteristic_descriptor_t.

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