usocket.gettaddrinfo does not work for IP addresses

[ritesh]

Calling usocket.gettaddrinfo() with an IP address and port number causes the badge to hang. I ran into this bug when trying to connect the badge to an MQTT server on my local network.

import mqtt
c = mqtt.MQTTClient('tilda', '192.168.1.2')
# hangs forever

The line that causes this is https://github.com/emfcamp/Mk3-Firmware/blob/master/lib/mqtt.py#L24

import usocket as socket
# This hangs
socket.gettaddrinfo('192.168.1.1', 1883)
# But this works fine
socket.gettaddrino('www.google.com', 1883)

usocket.gettaddrinfo() should work for both DNS names and IP addresses.

[marekventur]

We have handled this case on the lib layer for HTTP, it might be easier to fix it on that level for MQTT: https://github.com/emfcamp/Mk3-Firmware/blob/master/lib/http_client.py#L161-L166