CPSockets Updates

[askpatrickw]

will fix #24 (hopefully, someday...)

All the IoT Hub Examples are working.

The IoT Central examples all fail and are unable to connect.
You can see that the device registration works, it gets back iot central's hub.
But when connecting, it fails with OSError: 23 within the try in _get_connect_socket

20914.2: INFO - Establishing a SECURE SSL connection to iotc-snip-snip-snip-snip-snip.azure-devices.net:8883
Traceback (most recent call last):
  File "code.py", line 122, in <module>
  File "/lib/adafruit_azureiot/iotcentral_device.py", line 163, in connect
  File "/lib/adafruit_azureiot/iot_mqtt.py", line 387, in connect
  File "/lib/adafruit_azureiot/iot_mqtt.py", line 133, in _create_mqtt_client
  File "/lib/adafruit_minimqtt/adafruit_minimqtt.py", line 439, in connect
  File "/lib/adafruit_minimqtt/adafruit_minimqtt.py", line 273, in _get_connect_socket
RuntimeError: Repeated socket failures

I'm now wondering if the IoT Central API changed...

[askpatrickw]

@jimbobbennett I'm wondering if you know of a change in IoT Central that we need to sync-up to, or some other such change I'm just not aware of. tx!

[jimbobbennett]

I've done some digging, but have no idea why it's not working, and I can't see anything we're doing different to the unofficial MS Python IoT Central SDK. I'll follow up with the SDK team here to see if anything has changed.

[jimbobbennett]

I'm getting nowhere with this. It looks like something is different between the IoT Hubs created by IoT Central, and a standard IoT Hub created in the Azure Portal.

I tried generating the MQTT settings for the IoT Central hub using the official Azure Python SDK, and the CircuitPython library can't connect using the same settings.

I've asked around here so will update if I get more info.

[askpatrickw]

Thanks @jimbobbennett. Although frustrating, at least we both reproduced the same issue.

[askpatrickw]

Closing this PR which is now being fixed in PR #31