RE: Building at State Machine that monitors ble evt

Ulrich Myhre — Mon, 28 Jul 2014 17:28:56 GMT

If the services are using notifications and/or indications to send the calculated data, you can use the value of the Client Characteristic Configuration Descriptor (CCCD) to decide if your calculations are needed or not.

In the SDK example services, this is usually handled in the ble_*on_ble_evt() for events of the type BLE_GATTS_EVT_WRITE, usually leading to a local on_write() function that again will multiplex the write to a on*_cccd_write() function if appliccable. For the ble_cscs example, the service will send an BLE_CSCS_EVT_NOTIFICATION_ENABLED signal if the main context has specified an event handler for the service. You can then either use this signal in your main context to enable calculations, or it can be done in the service itself if that's a better fit for you.