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Try the below script in the AT Command Tester tool
//Script: at+caclose //AT+CACLOSE command is used to close tcp/udp connection in Simcom SIM70XX modules //Check SIMCOM Module AT Command documentaiton //Get the support for the commands AT+CACLOSE=? //Wait WAIT=1 //Get the current TCP configuration AT+CACLOSE? //Wait WAIT=2 //Open TCP connection //CID, PDP Index, connection type, server address, port AT+CAOPEN=0,0,"TCP","postman-echo.com",80 //Wait WAIT=5 //Close the connection AT+CACLOSE=0
Output of the above script in the AT Command Tester tool
AT+CACLOSE=? TCP connection is closed by remote server +CACLOSE: (0-12) TCP connection is closed by remote server OK AT+CACLOSE? TCP connection is closed by remote server ERROR AT+CAOPEN=0,0,"TCP","postman-echo.com",80 +CAOPEN: 0,0 OK AT+CACLOSE=0 TCP connection is closed by remote server OK