I am a newbie in LORA and TTN and try to subscribe a single payload-field, which I have published by Arduino and Dragino shield. In the TTN console (Apllication data) I can see the “payload” and the decoded field “led:”.
When I try to subscribe this single field with an Android client app like MQTT dash or MQTT dashboard or an other app or other Windows app or program I can only see all data, but I can’t see the single field “payload” or “led”.
For all data I used AppID/devices/deviceID/up. That was ok.
For a single field I used AppID/devices/deviceID/up/led, but here I saw no result.Why?
In my opinion, so far i have undertood MQTT in TTN, the payloads in TTN were automatically published as topics and the client, which wants to subscribe a payload-field, must only attach the name of the encoded payload field to the path for all data.
I don’t understand it, please help.