Error when calling set_load() function

[CStar01]

I'm trying to write a simple script to toggle the charge controller's load on and off.
client.set_load(1) works as expected and the controller's load turns on but client.set_load(0) throws an error and does not turn off the load ---Error Log-- INFO:root:on_read_operation_complete Data received INFO:root:setting load 0 ERROR:dbus.connection:Exception in handler for D-Bus signal: Traceback (most recent call last): File "/usr/lib/python3/dist-packages/dbus/connection.py", line 232, in maybe_handle_message self._handler(*args, **kwargs) File "/home/pi/.local/lib/python3.9/site-packages/gatt/gatt_linux.py", line 539, in properties_changed self.service.device.characteristic_value_updated(characteristic=self, value=bytes(value)) File "/home/pi/renogy-bt/renogybt/BLE.py", line 86, in characteristic_value_updated self.data_callback(value) File "/home/pi/renogy-bt/renogybt/RoverClient.py", line 57, in on_data_received super().on_data_received(response) File "/home/pi/renogy-bt/renogybt/BaseClient.py", line 74, in on_data_received self.on_read_operation_complete() File "/home/pi/renogy-bt/renogybt/BaseClient.py", line 88, in on_read_operation_complete self.on_data_callback(self, self.data) File "/home/pi/renogy-bt/toggle.py", line 24, in on_data_received client.set_load(0) File "/home/pi/renogy-bt/renogybt/RoverClient.py", line 67, in set_load self.device.characteristic_write_value(request) File "/home/pi/renogy-bt/renogybt/BLE.py", line 89, in characteristic_write_value self.write_characteristic.write_value(value) File "/home/pi/.local/lib/python3.9/site-packages/gatt/gatt_linux.py", line 565, in write_value bytes = [dbus.Byte(b) for b in value] TypeError: 'NoneType' object is not iterable

--My code-- def on_data_received(client, data): print("Data received") loadswitch = 0 if data["load_status"] == "off": loadswitch = 1 client.set_load(loadswitch) client.disconnect()

Connect

RoverClient(config, on_data_received).connect()

[cyrils]

I have merged a fix, can you check?

Also don't get into callback hell. Check data['function'] == 'WRITE' in the callback to disconnect.

[CStar01]

It is working now. Thank you I will add a function check, thanks again.