No received data from the sensor

damvancuong · August 7, 2020, 10:31am

it is still “Failed to parse JSON string”

damvancuong · August 7, 2020, 10:55am

it works. I just have to switch to J.payload

thank you so much for your help and your patience @velev
thanks for recommend @ZhuQI

velev · August 7, 2020, 11:07am

@damvancuong I am glad that we can help This expression was something that I learn just now, so … good for me too

damvancuong · August 9, 2020, 7:43pm

@velev I have a new problem that the sensor somehow did not send a payload but only the PhyPayload, which, as I looked up on the internet, only describles the AppEUI and DevEUI as Base64.
Unfortunately this is not the data for the temperature or humidity.
here is my ph payload:

Example of complete data-package:

can you tell me how I should set my gateway to get the correct data from the sensor?
Thanks a lot im advance!

velev · August 10, 2020, 9:22am

This is Join Request uplink. Can you show me the uplink in the Live Device Data tab in the Application menu?

Also to see the data like in the TTN you need a decoder. RAK7249 only supports Cayenne LPP decoder. You need to process the data decoding(show in a readable format) in Node-Red.

damvancuong · August 10, 2020, 9:37am

i have in the " Live Device Data" just only join like below. they showed up every 20 minutes. There is no uplink at all in the " Live Device Data"

I understand it. what i need is just the raw data so that i can convert it.

damvancuong · August 10, 2020, 9:46am

should I fill something in the fields for for example HTTP/HTTPS Headers, Uplink data URL, Join notification URL, Ack notification URL, Device-status notification URL.to get the uplink from sensor?

velev · August 10, 2020, 10:10am

If you use some of those integrations - yes. But I think you only use MQTT Broker. So this is not needed. The only thing is to set the Data Encode/Decode Type to HEX.
If you only see Join’s request this means that the node can not join. Can you check your Frequency settings and keys(Device EUI, Application EUI, and Application Key) both in the device and in the Gateway Network Server? Another useful thing will be to share the System Log of the Gateway with the Join Request in it, so we can better point you where is the problem.