How to interpret: weconnect/0/vehicles/xxxxx/domains/charging/chargingSettings/maxChargeCurrentAC : msg.payload : string[0]

[Domoberry]

Hi Forum,

I'm using some Node-RED flows as glue-logic between WeConnect-mqtt and Domoticz. I have noted in some cases an incoming value (payload) which I did not yet anticipate.

Example: weconnect/0/vehicles/xxxxx/domains/charging/chargingSettings/maxChargeCurrentAC
This typically has values 'reduced' or 'maximum', indicating the maximum charge rate (it is a writable topic as well).
However, I have recently noted that the received payload of the this mqtt message can temprary be 'empty', e.g. 'string[0]' as well.

How should I handle this? Or, what is the meaning of this empty mesage?
(perhaps the overarching question is: does an overview of all weconnect-mqtt topics and there possible/allowed values exists somewhere?)

[tillsteinbach]

An empty payload is indicating that the topic should be deleted. This happens when the property is not present in the message from the VW server anymore.

[Domoberry]

Thanks for the reply.
Per today, the same topic provides its normal values again. This 'empty' message happened few times, one time I captured the actual source message (string[0]) from weconnect, two other times I was not able to trace it back to the actual message from weconnect (not aware of logging there), my nodeRED translates anything other than the two known messages into 'unknown value' :-)