I didn't want to go to the specs on ANT+ just in case some licensing issue came about that I hadn't thought of.. although I very much doubt such an issue would exist.. and I just ported the SRM code inside GC v3.0 instead.
Greg was kind enough to make me a file.. I am in the ballpark but I need some more data to be 100% sure. I might be able to get my hands on an SRM in the coming days or so and I can merge this into main when I've fully tested it out.
But so far, so good.
The code is committed under the srm branch and here is the binary..
J