Insteon I2CS notes.

Turns out, the i2cs protocol is slightly more annoying than I was led to believe.  At first glance of the available docs out there, you would think that the only difference is everything gets sent with an extended command.  That is where you would be wrong. It turns out *some* commands are extended, and some are still std.

I recently purchased a pair of the outdoor modules, which are the new i2cs protocol.  Doing the ALDB stuff, and the initial setup was easy, just send all extended commands.  Send it fast on/off, on/off, (as extended) everything works great.  Send it 0x19, for status, and it just ignores it.  Turns out, the status command has to be sent as std, or it ignores it completely.

Sigh.