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+--- Thread: Sim7600E kc868_A4S GSM SIM Internet Is not working - 4G and 3G Enabled (/showthread.php?tid=8035)
Sim7600E kc868_A4S GSM SIM Internet Is not working - 4G and 3G Enabled - venuakil2 - 05-01-2025
Hi, I am Sim7600E kc868_A4S Model to call website URL after Internet activation.
SIM Yellow Light is blinking.
SIM call and SMS are working. But, Internet is not working. I have changed SIM Provider APN details
#include <HardwareSerial.h>
// Define SIM7600 UART
#define MODEM_RX 13 // Connect to SIM7600 TX
#define MODEM_TX 15 // Connect to SIM7600 RX
HardwareSerial sim7600(1); // Use UART1
const char* APN = "du"; // Set your network APN
const char* USER = ""; // Usually blank
const char* PASS = ""; // Usually blank
void setup() {
Serial.begin(115200); // USB serial
sim7600.begin(115200, SERIAL_8N1, MODEM_RX, MODEM_TX); // UART1
delay(5000); // Give time to power up
Serial.println("Initializing SIM7600...");
// Disable echo for clean output
sendATCommand("ATE0", "OK", 1000);
// Basic check
if (!retryCommand("AT", "OK", 2000, 3)) {
Serial.println("SIM7600 not responding!");
while (1);
}
// SIM card check
if (!sendATCommand("AT+CPIN?", "READY", 2000)) {
Serial.println("SIM Card not ready!");
while (1);
}
// Set LTE-only mode
sendATCommand("AT+CNMP=38", "OK", 3000);
sendATCommand("AT+CMNB=1", "OK", 3000);
// Set APN
String apnCmd = "AT+CGDCONT=1,\"IP\",\"" + String(APN) + "\"";
sendATCommand(apnCmd.c_str(), "OK", 3000);
// Attach to network
if (!sendATCommand("AT+CGATT=1", "OK", 10000)) {
Serial.println("Failed to attach to network!");
while (1);
}
// Activate PDP
if (!sendATCommand("AT+CGACT=1,1", "OK", 10000)) {
Serial.println("Failed to activate PDP!");
while (1);
}
// Show IP
printIPAddress();
}
void loop() {
// Optional: monitor SIM7600 data or implement HTTP
}
// ========== AT COMMAND HELPERS ==========
bool sendATCommand(const char* cmd, const char* expected, uint32_t timeout) {
sim7600.flush();
sim7600.println(cmd);
Serial.print(">> "); Serial.println(cmd);
uint32_t start = millis();
String response;
while (millis() - start < timeout) {
while (sim7600.available()) {
char c = sim7600.read();
Serial.write©;
response += c;
if (response.indexOf(expected) != -1) {
return true;
}
}
}
Serial.println("\n!! Timeout or Unexpected response:");
Serial.println(response);
return false;
}
bool retryCommand(const char* cmd, const char* expected, uint32_t timeout, int retries) {
for (int i = 0; i < retries; i++) {
if (sendATCommand(cmd, expected, timeout)) return true;
delay(1000);
}
return false;
}
void printIPAddress() {
Serial.println("Checking IP with AT+CGPADDR=1...");
sim7600.println("AT+CGPADDR=1");
delay(1000);
String response;
while (sim7600.available()) {
char c = sim7600.read();
Serial.write©;
response += c;
}
int ipStart = response.indexOf(",\"") + 2;
int ipEnd = response.indexOf("\"", ipStart);
if (ipStart > 1 && ipEnd > ipStart) {
String ip = response.substring(ipStart, ipEnd);
Serial.print("Assigned IP: ");
Serial.println(ip);
} else {
Serial.println("No IP Address Assigned");
}
}
OutPut
13:57:40.249 -> >> AT
13:57:42.215 -> !! Timeout or Unexpected response:
13:57:49.212 -> SIM7600 not responding!
Note : SIM calling is working
Note 2: SIM SMS are working.
Only Internet is not activated. I have to call website URL after Internet connected.
RE: Sim7600E kc868_A4S GSM SIM Internet Is not working - 4G and 3G Enabled - admin - 05-01-2025
we have demo code for SMS and CALL. SIM7600 support MQTT connection. what function you want to use? do you want use SIM7600 to visite internet webpage? or ?
RE: Sim7600E kc868_A4S GSM SIM Internet Is not working - 4G and 3G Enabled - venuakil2 - 05-02-2025
Hi , Thank you for Reply.
I have to Send call API URL with Post JSON Data and Connect WiFiClient socket for Heartbeat and communication purpose.
HTTPClient http;
WiFiClient client;
client.connect(serverIP, 80);
void sendTelemetry() {
HTTPClient http;
DynamicJsonDocument doc(512);
doc["serialNumber"] = device_serial_number; // alarmSystem.config.deviceID;
doc["temperature"] = alarmSystem.sensors.temperature;
doc["humidity"] = alarmSystem.sensors.humidity;
doc["current_mA"] = alarmSystem.sensors.current_mA;
doc["status"] = static_cast<int>(alarmSystem.currentState);
doc["doorOpen"] = alarmSystem.sensors.doorOpen ? 1 : 0;
doc["waterLeakage"] = alarmSystem.sensors.waterLeak ? 1 : 0;
doc["acPowerFailure"] = alarmSystem.sensors.powerFail ? 1 : 0;
doc["fire"] = alarmSystem.sensors.fire ? 1 : 0;
doc["temperature_alarm"] = 0;
if (alarmSystem.sensors.temperature > alarmSystem.config.tempThreshold) {
doc["temperature_alarm"] = 1;
}
String payload;
serializeJson(doc, payload);
sensorData=payload;
http.begin(serverURL + "/alarm_device_status");
http.addHeader("Content-Type", "application/json");
int httpCode = http.POST(payload);
//Serial.println(serverURL);
if (httpCode > 0) {
Serial.println("HTTP Response: " + String(httpCode));
} else {
Serial.println("HTTP Error: " + String(httpCode));
}
http.end();
}
RE: Sim7600E kc868_A4S GSM SIM Internet Is not working - 4G and 3G Enabled - venuakil2 - 05-02-2025
Can I use Configure PPP connection?
RE: Sim7600E kc868_A4S GSM SIM Internet Is not working - 4G and 3G Enabled - admin - 05-03-2025
i am not tested with pppoe connection, only have used mqtt. if esp32 work as a router with sim7600e, i think it's not very suitable.