Thank you for the sample TAIP / RVP data and references you sent. It appears that the SierraWireless mobile gateway configuration utility - the "ACE Manager" - allows an optional TAIP ID to be specified on its GPS page.
We will see what we can do to to extend the sample TAIP conector to: 1) Determine if this parameter has been included in the broadcast data; 2) Place the TAIP ID, if found, into the DeviceId field of the GeoEvent as a String.
I will follow-up with you as soon as possible. Thank you in advance for your patience.