Keepalive for 3rd party sim is mandatory?

Firmware
3

@ScruffR
Hi, thanks for your comment.
My application only post message to server and does not require input from the server. So it is good to know that I don’t need to handle keepAlive function.
Since I am only using library implemented here TlsTcpClient library on WebIDE published not exactly sure why electron fails to post message to the server.
So I decided to turn Cellular off and on again to regain connection to the server as below.

void resetNetwork()
{
   unsigned long connectTime = millis();
   int sec = 0;
   Serial.println("Cellular Off");
   Cellular.off();
   Serial.println("Cellular On");
   Cellular.on();
   Serial.println("Cellular Connect");
   Cellular.connect();
   while(Cellular.connecting()) {
      if((millis() - connectTime) > 1000) {
         connectTime = millis();
         sec++;
         Serial.printf("elapsed %d\r\n",sec);
      }
   }
   STARTUP(cellular_credentials_set("TM", "", "", NULL)); /* SET APN */
}

After running above code, I finally can re-establish connection to the server.
Do you think this solution is ok?