feat: add error trace

[de-sh]

Closes #

Changes

Log error message on disconnection

Why?

Trials Performed

Run uplink with json pointing to in-existent broker

2023-04-26T09:24:33.909442Z ERROR uplink::base::mqtt: disconnected I/O: Connection refused (os error 111): reconnects = 1   publishes = 0   pubacks = 0   pingreqs = 0   pingresps = 0  

  2023-04-26T09:24:36.911179Z ERROR uplink::base::mqtt: disconnected I/O: Connection refused (os error 111): reconnects = 2   publishes = 0   pubacks = 0   pingreqs = 0   pingresps = 0  

  2023-04-26T09:24:39.913571Z ERROR uplink::base::mqtt: disconnected I/O: Connection refused (os error 111): reconnects = 3   publishes = 0   pubacks = 0   pingreqs = 0   pingresps = 0 

Trying to connect to an HTTP server:

2023-04-26T09:25:46.812789Z ERROR uplink::base::mqtt: disconnected TLS: I/O: received corrupt message: reconnects = 1   publishes = 0   pubacks = 0   pingreqs = 0   pingresps = 0  

  2023-04-26T09:25:49.987146Z ERROR uplink::base::mqtt: disconnected TLS: I/O: received corrupt message: reconnects = 2   publishes = 0   pubacks = 0   pingreqs = 0   pingresps = 0