Hi, answered my own question. On the RC8221 from Lowe's, the value string seems to be different from the one Terence shows on github (https://github.com/edent/Sercomm-API)
The one from github would give:
adm/set_group.cgi?group=EVENT&event_mt=email:0;ftpu:0;httpn:1;httppost:0;smbc:0
but this gives an error (at least on my camera)
a string that works is:
adm/set_group.cgi?group=EVENT&event_mt=email:0;ftpu:0;op1:0;httpn:1;smbc:0;sd:0

Now I'm getting:
Alert: PIR & Motion Detection (bundle) triggered.
HTTP-NOTIFY:Send notification successfully.

In the logs!
Thanks for all the info on this blog.