# Cant get SIM7600E-LTE to initialise HTTPS

**URL:** <https://forum.arduino.cc/t/cant-get-sim7600e-lte-to-initialise-https/1403892>\
**Category:** General Guidance\
**Created:** [August 23, 2025, 12:02pm UTC](https://forum.arduino.cc/t/cant-get-sim7600e-lte-to-initialise-https/1403892 "2025-08-23T12:02:51Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![johnsmith66](https://avatars.discourse-cdn.com/v4/letter/j/f9ae1b/32.png) [@johnsmith66](https://forum.arduino.cc/u/johnsmith66)\
**Post date:** [August 23, 2025, 12:02pm UTC](https://forum.arduino.cc/t/cant-get-sim7600e-lte-to-initialise-https/1403892/1 "2025-08-23T12:02:51Z")

</div>

so im using a SIM7600E-LTE connected to an esp32, and im trying to get it to send data to firebase realtime database, so to test its functionallity i tried writing a simple script to send a message to the database and i just cant get it to work. i also tried using the TinyGsm library but that also didnt seem to work, at some point i managed to get two messages sent to the databse but ive got no clue how that happened and what version of code did that, but im prett shure it was something like this

```arduino
#include <Arduino.h>
#include <HardwareSerial.h>

const long Baudrate = 115200;
const char RX_Pin = 16;
const char TX_Pin = 17;

HardwareSerial sim(1);

void command(String command, unsigned long timeout = 1000) {
    sim.println(command);
    unsigned long startTime = millis();
    while (millis() - startTime < timeout) {
        if (sim.available()) {
            String response = sim.readString();
            Serial.println(response);
            break;
        }
    }
}

void upload(String jsonData) {
    //setup and bit of testing
    command("AT+CGDCONT=1,\"IP\",\"everywhere\""); // Set APN
    command("AT+CGATT=1");
    command("AT+CHTTPSSTART", 5000);
    command("AT+CSQ"); // start https service
    command("AT+CHTTPSOPSE=\"DB URL\",443,2", 10000);
    command("AT+CHTTPSSEND=0");
    while (sim.available()) {
        if (sim.find("DOWNLOAD")) break;
    }
    command("AT+CHTTPSSEND=\"POST\",\"/test.json\"", 15000);
    sim.print(jsonData);
    delay(200);
    command("AT+CHTTPSRECV", 5000);
    command("AT+CHTTPSCLSE", 5000);
    command("AT+CHTTPSSTOP", 5000);
}

void setup() {
    Serial.begin(115200);
    sim.begin(Baudrate, SERIAL_8N1, RX_Pin, TX_Pin);
    command("AT"); // test stuff
    command("ATI"); // module status stuff
    command("AT+CSQ"); // signal
    command("AT+CGDCONT=1,\"IP\",\"everywhere\"");
    command("AT+CGATT=1");
    upload("{\"message\":\"data test input v2\"}");
}

void loop() {
    while (sim.available()) {
        Serial.write(sim.read());
    }
}

```

output

```arduino
AT
OK

ATI
Manufacturer: SIMCOM INCORPORATED
Model: SIMCOM_SIM7600E-L1C
Revision: SIM7600M11_A_V2.0.1
IMEI: 862499070415105
+GCAP: +CGSM

OK

AT+CSQ
+CSQ: 18,99

OK

AT+CGDCONT=1,"IP","everywhere"
OK

AT+CGATT=1
OK

AT+CGDCONT=1,"IP","everywhere"
OK

AT+CGATT=1
OK

AT+CHTTPSSTART
OK

+CHTTPSSTART: 0

AT+CSQ
+CSQ: 18,99

OK

AT+CHTTPSOPSE=DB URL
OK

+CHTTPSOPSE: 0

AT+CHTTPSSEND=0
ERROR

AT+CHTTPSSEND="POST","/test.json"
ERROR

ata test input v2"}AT+CHTTPSRECV
ERROR

AT+CHTTPSCLSE
+CHTTPSCLSE: 0

OK

AT+CHTTPSSTOP
+CHTTPSSTOP: 0

OK

```

---

<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [February 19, 2026, 12:02pm UTC](https://forum.arduino.cc/t/cant-get-sim7600e-lte-to-initialise-https/1403892/2 "2026-02-19T12:02:54Z")

</div>

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