Very nice plugin!
Reading a MQTT topic with text into Domoticz works fine.
But I can´t get posting a text back into an MQTT topic to work.

MqttMapper.json:
{
"Kilometers_EX40": {
"topic": "house/kms-rijden",
"type": "243", "subtype":"19","switchtype":"0",
"mapping":{"item":"svalue"},
"set ...