Hi everyone, sorry i need your help to solve my problem that am facing, i need to transfer data to the webserver using arduino mega 2560 and sim800l but i failed to manage it i don't know where might be the problem. Below is the code... const char* server = "196.41.60.218"; const int port = 80; // Sensor values float volume = 1993.97; float percentage = 67.58; float water_height = 4.10; float lat_val = -6.874645; float lng_val = 39.465464; // Device ID String deviceID = "123456789"; void setup() { Serial.begin(9600); Serial3.begin(9600); // SIM800L connected to Serial3 delay(5000); // Give SIM800L module time to start Serial3.print("AT\r\n"); delay(2000); Serial3.print("AT+CMGF=1\r\n"); delay(2000); } void loop() { // Create the JSON payload with the sensor data and device ID String payload = "{"; payload += "\"deviceID\":\"" + deviceID + "\","; payload += "\"Volume\":" + String(volume) + ","; payload += "\"percentage\":" + String(percentage) + ","; payload += "\"height\":" + String(water_height) + ","; payload += "\"Latitude\":" + String(lat_val, 6) + ","; payload += "\"Longitude\":" + String(lng_val, 6); payload += "}"; // Establish a TCP connection Serial3.println("AT+CIPSTART=\"TCP\",\"" + String(server) + "\"," + String(port)); if (Serial3.find("OK")) { Serial.println("TCP connection established."); // Send the HTTP POST request String postRequest = "POST /twlms/data2.php HTTP/1.1\r\n"; postRequest += "Host: " + String(server) + "\r\n"; postRequest += "Content-Type: application/json\r\n"; postRequest += "Content-Length: " + String(payload.length()) + "\r\n\r\n"; postRequest += payload; Serial3.print("AT+CIPSEND="); Serial3.println(postRequest.length()); delay(1000); Serial3.println(postRequest); delay(2000); // Wait for the server response // Read and print the server response while (Serial3.available()) { char response = Serial3.read(); Serial.print(response); } Serial3.println("AT+CIPCLOSE"); Serial.println("TCP connection closed."); } delay(5000); // Delay between each data transmission }

[image] mwanyamaki96: Serial3.print("AT\r\n"); delay(2000); Serial3.print("AT+CMGF=1\r\n"); delay(2000); Just using "blind" delays like this is very bad practice! You need to read the actual response to each each command to know when it has completed & whether it was successful. What you're doing is like driving blindfold down a busy street, and just relying on time delays for when to turn the wheel, brake, etc! EDIT: [image] AT Command Guide for SIM 800/900 modules Programming Questions Questions that come up related to SIM 800/900 modules often use single Serial.println("AT_COMMAND_EXAMPLE"); lines for AT command execution, usually delays inserted between them and not checking the response for each command at all! As different commands execution time can vary greatly and each response from the module contains valuable information, this is far from reliable communication with such modules. Furthermore one particular command can take very different times, for example establishi…

ok thanks for the reply so how can i solve it?

Take a look at this one: [image] Read SMS text filter for credit value Programming Team, Trying to do the following with a SIM7600. Operator needs 2424 and BAL sent to retrieve the balance Output using AT commands directly and all I want is the credit 20.05. SMS text is at index 0 and +CMGRD=0 reads then deletes. Couple of questions is I need to factor if there is any other random SMS from the operator so every x hrs I run modem.sendAT("+CMGD=0,4"); that deletes all SMS texts so I should be at index 0 again. Thoughts? where I am going wrong? Its almost like code doesnt w… it has sendAT() and waitResponse() ...

Please show what you see on the serial console of the Mega when you run this code.

ok am getting this output [Screenshot 2023-07-13 140626]

am not dealing with sms here, i need smi800l to send data to the webserver just see inside the loop function

[image] mwanyamaki96: ok am getting this output ok am getting this output [Screenshot 2023-07-13 140626]

[image] mwanyamaki96: am not dealing with sms here I know. But that code shows you how to deal with AT command responses

that's why i came here to need some helps from the people including you, so if you know where might the problem in that code please correct it please..

Do you have access to the log file on the web server "196.41.60.218" ? Have you got the source code of PHP file twlms/data2.php ?

My sim800l failed to send data to the webserver

Projects General Guidance

awneil July 13, 2023, 11:55am 4

Take a look at this one:

it has sendAT() and waitResponse() ...

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My sim800l failed to send data to the webserver

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