Lora packet Decoding about lora-packet HOT 8 CLOSED

You're correct that this looks like hex - did you try a hex decoder? :-)

The lora-packet library is aimed at users who have the raw "wire-level" data, like you'd see going through a gateway. Your example is the decoded data from TTN, so all the LoRa decoding has happened already.

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Hi Dom,
I'm slightly puzzled by your words "your web interface": I only wrote an npm library.

Looking at your data, the "QKGfmAGAkQAClKBkJAt8EcGHPldTfy+u8mM8cDk=" is Base64, and is probably a raw packet suitable for decoding using this library. The first byte of your data (in hex) is 0x40, which is a valid LoRa "Message Type" byte meaning "Unconfirmed Data Up".

If you haven't tried this already, I suggest copying my "demo1.js" and substituting your data (converted appropriately). If you get a MIC failure & badly decrypted data, you could retry with the endian-ness of your keys reversed - I've written a bit about endianness in the README.

thanks
Anthony

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Hi Dom,
is it possible that your data is binary? In that case, you'd expect garbage from "toString"
Ant

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Hi Anthony,
I tried to do
lora_packet.decrypt(packet, AppSKey, NwkSKey).toString('hex')

I do get a HEX string like this
00000000000000fe2eca8bacaa40a670

But I tried to convert this to base64 also to Ascii but none of these convertions get me anywhere.
I am not sure if it was sent as Binary.. as I just get the payload as a JSON file.
if it is a Binary data.. how coud I get it back as ASCII text ? do you have any recommendations perhaps ?
regards
Dom

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Hi Dom,
that's great, so the decryption worked! (Failed decryption will look like random, not containing strings of zeros).

However, you'll need to investigate the binary format of your data yourself: I can't do this for you.

Anthony

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@anthonykirby

I'm slightly puzzled by your words "your web interface": I only wrote an npm library.

As an aside, that might be my https://runkit.com/avbentem/lorawan-packet-decoder which has a frontend available at https://runkit.io/avbentem/lorawan-packet-decoder/branches/master

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