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Try the below script in the AT Command Tester tool
//Script: at+cfswfile //The AT commands in this script are applicable for Simcom modules only //Check SIMCOM Module AT Command documentaiton //Get the support for the commands AT+CFSWFILE=? //Wait WAIT=1 //Allocate the data buffer AT+CFSINIT //Write to a file //1st parameter - index > 0 -/custapp/ 1-/fota/ 2-/datatx/ 3 -/customer/ //2nd parameter - FILE NAME //3RD parameter - Mode 0 -> overwrite 1->append //4th parameter - File size //5th parameter - input time //6th parameter - len_filename AT+CFSWFILE=0,"myfile.txt",0,12,10000 //Write data for the FILE, length should match file size paramter above my file data //Wait WAIT=2 //Write to the end of the FILE AT+CFSWFILE=0,"myfile.txt",1,10,10000 //Write data for the FILE, length should match file size paramter above add at end //Wait WAIT=2 //Get the txt file size AT+CFSGFIS=0,"myfile.txt"
Output of the above script in the AT Command Tester tool
AT+CFSWFILE=? +CFSWFILE: (0-3),50,(0-1),(1-10240),(100-10000) OK AT+CFSINIT OK AT+CFSWFILE=0,"myfile.txt",0,12,10000 DOWNLOAD OK AT+CFSWFILE=0,"myfile.txt",1,10,10000 DOWNLOAD OK AT+CFSGFIS=0,"myfile.txt" +CFSGFIS: 22 OK