Reading ZigBee Groups

[jamesonuk]

I have just helped someone out with an issue that has caught me out before.

AIUI when you add a device to a group the link is actually stored on the device and which makes sense.

The issues come along when you either delete a group in Z2M front end or just delete a device that was in a group and add it back later.

In the front-end you only sree devices that have been assigned to the group in Z2M so you can end up with phantom devices that turn on / off with the group but don't show up as being in the group (which again makes sense as I presume the groups are stored as you add them.

Question is whether it is possible to do something a little slicker? Is it possible to read the groups devices are assigned to and reflect this in Z2M? I guess it would be difficult to make group removal any more robust as you will always have the scenario of unplugging a device whilst in a group and then not bring able to send a message to that device to remove it.

[jamesonuk]

I find myself coming back to this trying to debug an issue where I think a device might be linked to a group that I don't think it is.

Now looking at the docs I see there are some group membership commands against the group cluster.

command 0x02 says it is Get group membership with parameters groupcount and grouplist and states

If the group count field of the command frame has a value of 0 indicating that the group list field is empty, the
entity SHALL respond with all group identifiers of which the entity is a member.

and from the UI I can send command 0x02 to the group cluster (0x0004) with the payload
{"groupcount: 0, grouplist: []}
and I get

Invoked '4.2' with payload '{"groupcount":0,"grouplist":[]}'

but I don't get a response which I guess means I am doing it wrong....

How can I see what comes back from this command?

[jamesonuk]

Bumping this again.... I believe I have a few bulbs which think they are in a group that Z2M does not.
The group data must be stored on the device so it knows whether or not to process group broadcast messages so presumably there is a way to read from it ???