Decode payload KPN loradeveloper and NodeRed
I got the most simple situation for a test, however I am stuck (for a while now) on using the values I send with a LoPy to the https://loradeveloper.mendixcloud.com.
1 LoPy connecting to the LoRa Wan of KPN towards the free testaccount.
This works like a charm. I press the button, and in notime a value is available at the portal.
So, on the LoPy I use the button to send a couple of bytes([0x01])' for testing.
Here a part of the code:
print("Toggle LED") p_out.toggle() print("sending") print(bytes([0x01])) s.send(bytes([0x01])) sleep(1) print("done") sleep(5)**
First I expected to see a string like 01 or something on the debugger at the KPN developer portal. But this is what I see:
1st klick on the button I see value 74
2nd click on the button I see value 55... etc
So my assumtion is that the value I send is encoded and stored, and visible as 'strange' values.
Question 1: Am I right?
So the next step is sending te value to a place to be processed. I choose the IBM bluemix in combination with NoSQL and NodeRed (ideal for testing, you only pay for run-time and costs 0.07 USD per hour, so stop the application and you pay nothing)
Also here I got pretty far (for my knowledge) I get the value (the encoded I think) every time I press the button for the first time (value 74) on the LoPy.
Great, but now I'm stuck, and stuck for over 2 weeks and getting frustrated and showing signs of insanity.
How do I decode this value 74 back to the bytes (b[0x01]) I send originally?
I guess I need the Application Secret Key (AppSKey?) in combination with the Network Secret Key (NwkSKey?)
I hope someone can help me to get this hurdle tackled. Perhaps someone has links to the solution. Thanks in advance.
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RobTuDelft last edited by
Question 1: that is correct, the payload is still encrypted.
Question 2: this has been discussed before here. I would like to refer you to Pierre's blog here.