aci_gatt_update_char_value never returns

BStic.1 · ‎2021-06-09

I am trying to send a BLE notification after I have connected.

I add the characteristic this way.

    retVal = aci_gatt_add_char(serviceHandle,
                      UUID_TYPE_128,
                      (const Char_UUID_t *)Uuid,
                      247,
                      CHAR_PROP_WRITE_WITHOUT_RESP | CHAR_PROP_WRITE | CHAR_PROP_NOTIFY,
                      ATTR_PERMISSION_NONE,
                      GATT_NOTIFY_ATTRIBUTE_WRITE,
                      MAX_ENCRY_KEY_SIZE, 
                      CHAR_VALUE_LEN_VARIABLE,
                      &handle);

Then the connected device writes a small amount of data to the characteristic (3 bytes), and I try to send a notification in response.

result = aci_gatt_update_char_value(serviceHandle, valueHandle, 0, length, pData);

The notification is about 80 bytes long. I get the notification data on the other side, but the call to aci_gatt_update_char_value never returns. It gets stuck in hci_send_req waiting for something to happen, and it never happens. This seems like it would be super simple. What am I doing wrong here?

Thanks

BStic.1 · ‎2021-06-10

Whoops, calling from critical section, dont do that....