CODEWITHSUNDEEP
xbeemicropythonzigbee
Ulrar
Ulrar

Reputation: 983

Zigbee interview process - xbee

I have a zigbee2mqtt / home assistant setup working fine, and I'd like to try to make my own simple devices to connect to that network. I got an xbee 3 board, and using micropython to start with I was able to connect to my network.

However the "interview" fails. The xbee receives a message with a cluster 0, profile 260 (home automation) and endpoint 230 (command). Not sure what the payload contains, that's not a string :

{'profile': 260, 'dest_ep': 230, 'broadcast': False, 'sender_nwk': 0, 'source_ep': 1, 'payload': b'\x10\x02\x00\x05\x00\x04\x00\x07\x00', 'sender_eui64': b"\x00\x12K\x00\x18\xe2I'", 'cluster': 0}

My question is what should I answer for the interview to succeed ? I'm making only a basic sensor, I'd like to just report 1 weight reading periodically. I'm assuming I need to send back something saying I have one endpoint, on some cluster (not sure which, I guess something in the 400s) but I don't know what the format should be.

I couldn't find much info on this (baring how to use things like the Zigbee Cluster Library, which aren't python), any pointers or examples of end devices I could take a look at to understand how this interview process works ?

Unfortunately digi's examples all seem to involve xbee devices talking to each other, I couldn't find any examples of how to make a regular end device.

Thanks !

EDIT: Just found this great page which explains how this all works. Still need to figure out the exact bits I'll need and try it out, but now I know where to start !

Upvotes: 1

Views: 1014

Answers (1)

tomlogic
tomlogic

Reputation: 11694

This sounds a lot like the ZCL, and I'm not aware of an Open Source Python implementation of that protocol. Digi has an Open Source ANSI C Library that includes a ZCL implementation. If you can read C code, you might be able to decode that payload to see what it's asking. You might also need to handle some of the ZDO/ZDP (Zigbee Data Object/Device Profile) protocol on endpoint 0, by setting ATAO=3 (IIRC). There's also ZDO/ZDP code in that C library. (Full disclosure: I wrote most of the code in that library, including the Zigbee layer. But I haven't worked with Zigbee in a long time, so I'm rusty on protocol details.)

My recommendation would be to just hardcode hand-generated responses as much as possible. Figure out the expected format for requests, and determine what works as a response. If you can sniff the 802.15.4 traffic, or have your zigbee2mqtt gateway log activity with an existing device, you might be able to use its responses as a starting point for your implementation.

Upvotes: 1

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