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extmod/modbluetooth: Implement MTU.

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This commit is contained in:
Jim Mussared
2020-09-11 18:12:36 +10:00
parent f271b96b5c
commit 857e2c8fd5
4 changed files with 116 additions and 4 deletions
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36
extmod/btstack/modbluetooth_btstack.c
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@@ -264,6 +264,11 @@ STATIC void btstack_packet_handler_att_server(uint8_t packet_type, uint16_t chan
uint16_t value_handle = att_event_handle_value_indication_complete_get_attribute_handle(packet);
uint8_t status = att_event_handle_value_indication_complete_get_status(packet);
mp_bluetooth_gatts_on_indicate_complete(conn_handle, value_handle, status);
} else if (event_type == ATT_EVENT_MTU_EXCHANGE_COMPLETE) {
// This is triggered in peripheral mode, when exchange initiated by us or remote.
uint16_t conn_handle = att_event_mtu_exchange_complete_get_handle(packet);
uint16_t mtu = att_event_mtu_exchange_complete_get_MTU(packet);
mp_bluetooth_gatts_on_mtu_exchanged(conn_handle, mtu);
} else if (event_type == HCI_EVENT_LE_META || event_type == HCI_EVENT_DISCONNECTION_COMPLETE) {
// Ignore, duplicated by att_server.c.
} else {
@@ -339,8 +344,6 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
DEBUG_printf(" --> btstack # conns changed\n");
} else if (event_type == HCI_EVENT_VENDOR_SPECIFIC) {
DEBUG_printf(" --> hci vendor specific\n");
} else if (event_type == GATT_EVENT_MTU) {
DEBUG_printf(" --> hci MTU\n");
} else if (event_type == HCI_EVENT_DISCONNECTION_COMPLETE) {
DEBUG_printf(" --> hci disconnect complete\n");
uint16_t conn_handle = hci_event_disconnection_complete_get_connection_handle(packet);
@@ -621,6 +624,9 @@ int mp_bluetooth_init(void) {
#if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
gatt_client_init();
// We always require explicitly exchanging MTU with ble.gattc_exchange_mtu().
gatt_client_mtu_enable_auto_negotiation(false);
#endif
// Register for HCI events.
@@ -1042,6 +1048,24 @@ int mp_bluetooth_gatts_set_buffer(uint16_t value_handle, size_t len, bool append
return mp_bluetooth_gatts_db_resize(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, len, append);
}
int mp_bluetooth_get_preferred_mtu(void) {
if (!mp_bluetooth_is_active()) {
mp_raise_OSError(ERRNO_BLUETOOTH_NOT_ACTIVE);
}
return l2cap_max_le_mtu();
}
int mp_bluetooth_set_preferred_mtu(uint16_t mtu) {
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
l2cap_set_max_le_mtu(mtu);
if (l2cap_max_le_mtu() != mtu) {
return MP_EINVAL;
}
return 0;
}
int mp_bluetooth_gap_disconnect(uint16_t conn_handle) {
DEBUG_printf("mp_bluetooth_gap_disconnect\n");
gap_disconnect(conn_handle);
@@ -1204,6 +1228,14 @@ int mp_bluetooth_gattc_write(uint16_t conn_handle, uint16_t value_handle, const
return btstack_error_to_errno(err);
}
int mp_bluetooth_gattc_exchange_mtu(uint16_t conn_handle) {
DEBUG_printf("mp_bluetooth_exchange_mtu: conn_handle=%d mtu=%d\n", conn_handle, l2cap_max_le_mtu());
gatt_client_send_mtu_negotiation(&btstack_packet_handler_att_server, conn_handle);
return 0;
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
#endif // MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK