thanks a lot,
something happened not like before it didn’t happen at all.
but an error occurred that
i have added the json node but it is still “failed to parse JSON String”
i have added the json node but it is still “failed to parse JSON String”
can you also tell me what should i enter when i only want to be subscribed to one topic for example the Status Topic?
For the error can you check your Gateway firmware version?
For topics, you need to change the data in the double curly brackets with your actual data.
For example for status topic, it will be: application/1/device/DEVICE_EUI/status
You need to change DEVICE_EUI with your real one.
my Gateway firmware version P01.005 RAK7258-03-142 868ME.
and in the Properties of the MQTT IN connector in node-red what should i enter instead of “#” for example for status topic?
Can you open the status page, and scroll down to System frame?
The correct topic is “application/1/device/DEVICE_EUI/status”
You need to change DEVICE_EUI with your real Devide EUI.
Ok. Please update the firmware to the latest one RAK7285 Latest Firmware. Don’t forget to extract the bin file first.
Updating the firmware manual https://doc.rakwireless.com/quick-start/rak7258-micro-gateway/system Point 4.
And after that please check if the timestamp error persist in Node-Red.
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
@damvancuong I am glad that we can help 
This expression was something that I learn just now, so … good for me too 
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@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!
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.
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.
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?
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.
the System Log of the Gateway and the Live Device Data
I have entered the keys correctly, can you show me how I can check the frequency.
