Bluetooth.CHAR_NOTIFY_EVENT When triggered

[Little Freak]

Hey, I am trying this Tutorial https://docs.pycom.io/tutorials/networks/ble/callback/ and it doesn't execute the char_notify_callback function in the client.

So my question is, when does the Bluetooth.CHAR_NOTIFY_EVENT get triggered?
Where can I find the source code of the network lib?

I use 2 LoPys, one of them is the client and the other one the server

[Gijs]

Could you perhaps add some print statements to see where the code stops?

When trying this example, I did have some difficulty syncing both devices up (with correct connection / disconnection status) But was able to make it work

[Little Freak]

@Gijs in the client I never get in the char_notify_callback method and also never send a read request.
If I try a char.read() after the line, where I call the Callback method, then I get this error:

Unhandled exception in callback handler
TypeError: function takes 2 positional arguments but 1 were given

[Gijs]

Are you running the same firmware on both devices, I tried with the latest stable release, 1.20.2.r4. Also, could you check whether the conn_cb is triggered on the Server device, and whether Connected to FiPy 45 is printed on the Client?

Im not sure what you mean with char.read()?

[Little Freak]

@Gijs An update fixed my problem, thank you.
Do you know, when this in the server is triggered?

chr1.callback(trigger=(Bluetooth.CHAR_READ_EVENT | Bluetooth.CHAR_SUBSCRIBE_EVENT), handler=chr1_handler)

[Gijs]

When you read the characteristic. The actual reading is done at conn.services(), but we later register the callback on the Client side. a CHAR_READ_EVENT triggers the callback on the server side to send data

[Little Freak]

@Gijs where can i find a documentation, where the trigger is discribed?

[livius]

@Little-Freak
https://docs.pycom.io/firmwareapi/pycom/network/bluetooth/gattscharacteristic/#characteristiccallbacktriggernone-handlernone-argnone