Update LandroidS.ts

[lukicsl]

mosquitto_pub -h vevedock -t 'landroid/set/mow' -m "stop"
is generation and error:
landroid_landroid.1.88y4dpx7iq8p@vevedock-01 | [2019-05-11T17:43:29.081] [INFO] Mqtt - Incoming MQTT message to topic landroid/set/mow: stop landroid_landroid.1.88y4dpx7iq8p@vevedock-01 | [2019-05-11T17:43:29.082] [ERROR] LandroidS - Invalid MQTT payload for topic set/mow payload stop
This at least shows the payload but does not help any further, will open an issue

[DBa2016]

In the comparison statements, replace 'payload === "start"' by 'payload.toString("") === "start"' (same for stop, of course).

In my tests, payload was a "Buffer" object. The reason why your modified log.error statement shows a string is that it seems to do an implicit conversion, by calling payload's ".toString()" method - however, "===" specifically compares data types, so it compares a string to a Buffer, which results in "False".

I don't want to interfer with your PR, so will let you implement this.

[DBa2016]

I actually realized this is needed for HA integration improvement, so I resolved it in PR #61