It uses an Ethernet connection and their APP. I never looked at the network communications.
Isn't the XTB-232 a serial type connection?
On the chance you didn't get it. The P2 Quick Start Guide.
Yes, I downloaded the Quick Start Guide from the earlier link, but it doesn't get into any communication details. The Modem Developers Guide does that.
What isn't clear in that document is whether there is handshaking with the "02" on transmission before the other bytes are sent. And it appears there is no handshaking at all on receiving. The IM just sends a 4-byte burst and assumes the computer received it properly.
In addition to the X10 transmit and receive, there are other commands associated with the IM configuration. I wondered which of those commands must be supported.
The XTB-232 is not a network device. It emulates the same serial port communication used by the X10 CM11A. The IM uses a typical Ethernet cable, but it is actually configured for a 19.2K Baud serial port. So the cable used for the XTB-232 mod would have to be custom made using the 3 serial port lines - TX, RX, GND.
I don't have any information on how the SmartHome IM connects to the Harmony. I had assumed that would be the 19.2K Baud serial link, but I have not found any documentation on how that is actually implemented. Does one use a USB to serial adapter plugged into the Harmony? If so, then the same USB to serial adapter should work for the XTB-XM except the cable would have to be modified from the 8-wire to the 4-wire connector used for the CM11A / XTB-232.
Jeff