Edgent example for TTGO T-Call GSM board?

I’ve not done any testing with this for over a year, and nothing with Blynk.Air, but I did manage to get a setup that works for HTTP updates over a GSM connection.
I was putting the firmware files onto my own HTTP server and using port forwarding and a DDNS server to make then publicly visible.

I used the TinyGsmClient.h and BlynkSimpleTinyGSM.h and I think I had to use an older version of the ESP32 core, but I can’t find my notes on it at the moment.

Relevant snippets of code are:

TinyGsm modem(SerialAT);
TinyGsmClient client(modem);
  HTTPClient httpClient;
  httpClient.begin(upgrade_path);
  int httpCode = httpClient.GET();
  if( httpCode == 200 ) 
  {
    // handle the upgrade here....

This was based on this post from @mikekgr

Pete.