MQTT disconnected and not attempting to reconnect

[DavidAntliff]

Disconnected around Dec 20, didn't reconnect by itself. May need smarter state machine.

[DavidAntliff]

Disconnected again 2019-01-20 17:26:40 and did not reconnect by 2019-01-28.

Log shows:

W (-2052395071) esp_mqtt: esp_mqtt_publish: not connected
W (-2052395071) mqtt: esp_mqtt_publish failed
W (-2052395011) power: output temperature measurement has expired
W (-2052390371) esp_mqtt: esp_mqtt_publish: not connected
W (-2052390371) mqtt: esp_mqtt_publish failed
W (-2052390371) esp_mqtt: esp_mqtt_publish: not connected
W (-2052390371) mqtt: esp_mqtt_publish failed
W (-2052390071) esp_mqtt: esp_mqtt_publish: not connected
W (-2052390071) mqtt: esp_mqtt_publish failed
W (-2052385071) esp_mqtt: esp_mqtt_publish: not connected
W (-2052385071) mqtt: esp_mqtt_publish failed
W (-2052385011) power: output temperature measurement has expired
W (-2052380371) esp_mqtt: esp_mqtt_publish: not connected
W (-2052380371) mqtt: esp_mqtt_publish failed
W (-2052380371) esp_mqtt: esp_mqtt_publish: not connected
W (-2052380371) mqtt: esp_mqtt_publish failed
W (-2052380071) esp_mqtt: esp_mqtt_publish: not connected
W (-2052380071) mqtt: esp_mqtt_publish failed
W (-2052375071) esp_mqtt: esp_mqtt_publish: not connected
W (-2052375071) mqtt: esp_mqtt_publish failed
W (-2052375011) power: output temperature measurement has expired

Note that the timestamp has rolled over - may not be related though.