Parsing a mqtt message error

Setup, Configuration and Use Beginners
1

on one of my host i see often :

2022-12-12 20:34:19.023 [WARN ] [t.generic.ChannelStateTransformation] - Executing the JSONPATH-transformation failed: Invalid path ‘/$.voltage’ in ‘{“battery”:100,“humidity”:53.4,“last_seen”:“2022-12-12T20:34:19+01:00”,“linkquality”:94,“temperature”:20.8,“voltage”:3000}’
2022-12-12 20:34:24.560 [WARN ] [t.generic.ChannelStateTransformation] - Executing the JSONPATH-transformation failed: Invalid path ‘/$.voltage’ in ‘{“battery”:100,“humidity”:53.4,“last_seen”:“2022-12-12T20:34:24+01:00”,“linkquality”:94,“temperature”:20.8,“voltage”:3000}’
2022-12-12 23:05:25.269 [WARN ] [m.internal.handler.PWMTriggerHandler] - Dead-man switch activated. Disabling output
2022-12-12 23:21:11.456 [WARN ] [m.internal.handler.PWMTriggerHandler] - Dead-man switch activated. Disabling output
2022-12-13 00:37:00.311 [WARN ] [t.generic.ChannelStateTransformation] - Executing the JSONPATH-transformation failed: Invalid path ‘/$.voltage’ in ‘{“battery”:100,“humidity”:53.4,“last_seen”:“2022-12-13T00:37:00+01:00”,“linkquality”:98,“temperature”:20.8,“voltage”:3000}’
2022-12-13 00:37:18.907 [WARN ] [t.generic.ChannelStateTransformation] - Executing the JSONPATH-transformation failed: Invalid path ‘/$.voltage’ in ‘{“battery”:100,“humidity”:53.4,“last_seen”:“2022-12-13T00:37:18+01:00”,“linkquality”:98,“temperature”:20.8,“voltage”:3000}’
2022-12-13 04:39:28.054 [WARN ] [t.generic.ChannelStateTransformation] - Executing the JSONPATH-transformation failed: Invalid path ‘/$.voltage’ in ‘{“battery”:100,“humidity”:53.4,“last_seen”:“2022-12-13T04:39:28+01:00”,“linkquality”:98,“temperature”:20.8,“voltage”:3000}’
i
there are many temp sensors publishing this messages - all are the same, thing config:

                 Channels:
                            Type number : temperature "Temperatura" [ stateTopic="zigbee2mqtt/Temp_1", transformationPattern="JSONPATH:$.temperature"]
                            Type number : humidity "Wilgotnosc" [ stateTopic="zigbee2mqtt/Temp_1", transformationPattern="JSONPATH:$.humidity"]
                            Type number : battery "Bateria" [ stateTopic="zigbee2mqtt/Temp_1", transformationPattern="JSONPATH:$.battery"]
                            Type number : linkquality "Link" [ stateTopic="zigbee2mqtt/Temp_1", transformationPattern="JSONPATH:$.linkquality"]
                            Type number : voltage "Napiecie" [ stateTopic="zigbee2mqtt/Temp_1", transformationPattern="JSONPATH:$.voltage"]

so there is nothing unusual in this setup. i am using this setup on few hosts and this is the only one where i see problem

2

What’s that slash doing in there?

3

i don’t know. it is only visible in the logs

  • id: voltage
    channelTypeUID: mqtt:number
    label: Napiecie
    description: null
    configuration:
    retained: false
    postCommand: false
    step: 1
    formatBeforePublish: “%s”
    stateTopic: zigbee2mqtt/Temp_4
    transformationPattern: JSONPATH:$.voltage
4

I believe you have many devices and one of them has the slash in the config.

In any case I’d suggest not using json at all.

Use attribute

5

they are all configured exactlly the same… which binding should i put to higher log level to see the details?

6

Mqtt.generic
Do a list -s | grep mqtt for the full name