Empty objectJSON from mosquitto_sub

1

Hi all, I am trying to get my uplink data using

mosquitto_sub -t “application/1/device/+/event/up” -v

I can get some data from this command and also from the application web interface, it shows that there are uplink data arriving. However, I could not see my sensor data payload anywhere. Here is the data that is showing for mosquitto_sub

{“applicationID”:“1”,“applicationName”:“mytanah-application”,“deviceName”:“test-device-1”,“devEUI”:“1dgCGIX/izM=”,“rxInfo”:,“txInfo”:{“frequency”:924400000,“modulation”:“LORA”,“loRaModula
tionInfo”:{“bandwidth”:125,“spreadingFactor”:9,“codeRate”:“4/5”,“polarizationInversion”:false}},“adr”:true,“dr”:3,“fCnt”:22,“fPort”:1,“data”:“SGVsbG8sIHdvcmxk”,“objectJSON”:“”,“tags”:{},“confirmedUplink”:false,“devAddr”:“AH2ROw==”,“publ
ishedAt”:“2022-02-24T16:19:29.544765889Z”}

The objectJSON is empty. Does this mean that my end node did not send out my data? I am pretty sure it did though. I have also set the marshaler to json. Can someone point me in the right direction?

Thanks in advance

2

The decrypted payload is in the ‘data’ field, which is populated. You can base64 decode it for the bytes.

objectJSON will be populated if you have a JavaScript decoder set up and if it runs successfully. You haven’t mentioned if that is the case.

3

Thanks for the info. I have not setup a javascript decoder. Is it normal to have some uplink packets with null ‘data’ field in between packets with ‘data’ field populated?

4

Yes, I’ve seen that, but it depends on the device/firmware.