SIM7600E-H closes SSL/TCP connection straight after HTTPS Get Request

[AaronConvery]

[ ] I have read the Troubleshooting section of the ReadMe

What type of issues is this?

[ ] Request to support a new module

[ ] Bug or problem compiling the library [ ] Bug or issue with library functionality (ie, sending data over TCP/IP) [ ] Question or request for help

What are you working with?

Modem: SIM7600E-H Main processor board: ESP-32-WROVER-E TinyGSM version: 0.11.7 Code: /** *

• TinyGSM Getting Started guide:
• NOTE:
• Some of the functions may be unavailable for your modem.
• Just comment them out.

• **/

define TINY_GSM_MODEM_SIM7600

// Set serial for debug console (to the Serial Monitor, default speed 115200)

define SerialMon Serial

// Set serial for AT commands (to the module)

define SerialAT Serial1

// See all AT commands, if wanted // #define DUMP_AT_COMMANDS

// Define the serial console for debug prints, if needed

define TINY_GSM_DEBUG SerialMon

/*

• Tests enabled */

  define TINY_GSM_TEST_GPRS true

  define TINY_GSM_TEST_TCP true

  // powerdown modem after tests

  define TINY_GSM_POWERDOWN true

// set GSM PIN, if any

define GSM_PIN ""

// Your GPRS credentials, if any const char apn[] = "your_apn"; // Your operator APN const char gprsUser[] = "your_gprs_user"; const char gprsPass[] = "your_gprs_password";

// Server details to test TCP/SSL const char server[] = "your_server"; const char resource[] = "/your_resource"; const int port = 443;

include

include

include "SSLClient.h"

include "utilities.h"

include "certs.h"

ifdef DUMP_AT_COMMANDS

include

StreamDebugger debugger(SerialAT, SerialMon); TinyGsm modem(debugger);

else

TinyGsm modem(SerialAT);

endif

// HTTPS Transport TinyGsmClient base_client(modem, 0); SSLClient secure_layer(&base_client); HttpClient client = HttpClient(secure_layer, server, port);

void setup() { // Set console baud rate SerialMon.begin(115200); delay(10);

// Set GSM module baud rate
SerialAT.begin(UART_BAUD, SERIAL_8N1, MODEM_RX, MODEM_TX);

/*
The indicator light of the board can be controlled
*/
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, HIGH);

/*
MODEM_PWRKEY IO:4 The power-on signal of the modulator must be given to it,
otherwise the modulator will not reply when the command is sent
*/
pinMode(MODEM_PWRKEY, OUTPUT);
digitalWrite(MODEM_PWRKEY, HIGH);
delay(300); //Need delay
digitalWrite(MODEM_PWRKEY, LOW);

/*
MODEM_FLIGHT IO:25 Modulator flight mode control,
need to enable modulator, this pin must be set to high
*/
pinMode(MODEM_FLIGHT, OUTPUT);
digitalWrite(MODEM_FLIGHT, HIGH);

//Add CA Certificate
secure_layer.setCACert(root_ca);

}

void light_sleep(uint32_t sec ) { esp_sleep_enable_timer_wakeup(sec * 1000000ULL); esp_light_sleep_start(); }

void loop() { bool res ;

// Restart takes quite some time
// To skip it, call init() instead of restart()
DBG("Initializing modem...");
if (!modem.init()) {
  if (!modem.restart()) {
    DBG("Failed to restart modem, delaying 10s and retrying");
    // restart autobaud in case GSM just rebooted
    return;
  }
}

if TINY_GSM_TEST_GPRS

/*  Preferred mode selection : AT+CNMP
      2 – Automatic
      13 – GSM Only
      14 – WCDMA Only
      38 – LTE Only
      59 – TDS-CDMA Only
      9 – CDMA Only
      10 – EVDO Only
      19 – GSM+WCDMA Only
      22 – CDMA+EVDO Only
      48 – Any but LTE
      60 – GSM+TDSCDMA Only
      63 – GSM+WCDMA+TDSCDMA Only
      67 – CDMA+EVDO+GSM+WCDMA+TDSCDMA Only
      39 – GSM+WCDMA+LTE Only
      51 – GSM+LTE Only
      54 – WCDMA+LTE Only
  */
String ret;
do {
    ret = modem.setNetworkMode(54);
    delay(500);
} while (!ret);

String name = modem.getModemName();
DBG("Modem Name:", name);

String modemInfo = modem.getModemInfo();
DBG("Modem Info:", modemInfo);

// Unlock your SIM card with a PIN if needed
if (GSM_PIN && modem.getSimStatus() != 3) {
    modem.simUnlock(GSM_PIN);
}

DBG("Waiting for network...");
if (!modem.waitForNetwork(600000L)) {
    light_sleep(10);
    return;
}

if (modem.isNetworkConnected()) {
    DBG("Network connected");
}

endif

if TINY_GSM_TEST_GPRS

DBG("Connecting to", apn);
if (!modem.gprsConnect(apn, gprsUser, gprsPass)) {
    light_sleep(10);
    return;
}

res = modem.isGprsConnected();
DBG("GPRS status:", res ? "connected" : "not connected");

String ccid = modem.getSimCCID();
DBG("CCID:", ccid);

String imei = modem.getIMEI();
DBG("IMEI:", imei);

String imsi = modem.getIMSI();
DBG("IMSI:", imsi);

String cop = modem.getOperator();
DBG("Operator:", cop);

  /*  Network mode : AT+CNSMOD
    0 – no service
    1 - GSM
    2 - GPRS
    3 - EGPRS (EDGE)
    4 - WCDMA
    5 - HSDPA only(WCDMA)
    6 - HSUPA only(WCDMA)
    7 - HSPA (HSDPA and HSUPA, WCDMA)
    8 - LTE
    9 - TDS-CDMA
    10 - TDS-HSDPA only
    11 - TDS- HSUPA only
    12 - TDS- HSPA (HSDPA and HSUPA)
    13 - CDMA
    14 - EVDO
    15 - HYBRID (CDMA and EVDO)
    16 - 1XLTE(CDMA and LTE)
    23 - eHRPD
    24 - HYBRID(CDMA and eHRPD)
*/
modem.sendAT(GF("+CNSMOD?"));
if (modem.waitResponse(GF(GSM_NL "+CNSMOD:")) != 1) { }
int nmodec = modem.stream.readStringUntil(',').toInt() != 0;
int nmode = modem.stream.readStringUntil('\n').toInt();
modem.waitResponse();
DBG("Network Mode:", nmode);

IPAddress local = modem.localIP();
DBG("Local IP:", local);

int csq = modem.getSignalQuality();
DBG("Signal quality:", csq);

endif

if TINY_GSM_TEST_TCP && defined TINY_GSM_MODEM_HAS_TCP

if (!modem.isGprsConnected()) {
    DBG("... not connected");
} else {
    DBG("Connecting to ", server);
    // Make a HTTPS GET request:
    Serial.println("Making GET request securely...");
    client.get(resource);
    int status_code = client.responseStatusCode();
    String response = client.responseBody();

    Serial.print("Status code: ");
    Serial.println(status_code);
    Serial.print("Response: ");
    Serial.println(response);

    client.stop();        
}

endif

if TINY_GSM_TEST_GPRS

modem.gprsDisconnect();
light_sleep(5);
if (!modem.isGprsConnected()) {
    DBG("GPRS disconnected");
} else {
    DBG("GPRS disconnect: Failed.");
}

endif

if TINY_GSM_POWERDOWN

// Try to power-off (modem may decide to restart automatically)
// To turn off modem completely, please use Reset/Enable pins
modem.poweroff();
DBG("Poweroff.");

endif

SerialMon.printf("End of tests. Enable deep sleep , Will wake up in %d seconds", TIME_TO_SLEEP);

//Wait moden power off
light_sleep(5);

esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
delay(200);
esp_deep_sleep_start();

while (1);

}

Scenario, steps to reproduce

When I use the example HTTPS Get code for the SIM7600 provided with the SSLClient library I can make a successful Get request to the given server and resource. However when I change the address to my specific server and resource it keeps closing the connection straight after making the request then re-opening it and closing again with an error. I can see on my server side that it is actually logging the get requests as successful with status code 200 but it never prints in my serial

Expected result

I should be receiving the expected string back from my server after a successful get request

Actual result

Below are the logs of what Im actually getting with server name redacted 10:11:45.493 -> [1521] Connecting to [server] 10:11:45.532 -> Making GET request securely... 10:11:45.532 -> AT+CIPCLOSE=0 10:11:45.532 -> 10:11:45.532 -> +CIPCLOSE: 0,4 10:11:45.532 -> 10:11:45.532 -> ERROR 10:11:45.532 -> AT+CIPRXGET=1 10:11:45.532 -> 10:11:45.532 -> OK 10:11:45.532 -> AT+CIPOPEN=0,"TCP","[server]",443 10:11:45.532 -> 10:11:45.532 -> OK 10:11:45.736 -> 10:11:45.736 -> +CIPOPEN: 0,0 10:11:45.736 -> AT+CIPCLOSE=0 10:11:45.736 -> 10:11:45.736 -> OK 10:11:45.736 -> Failed to make GET request, error: -1 10:11:45.736 -> Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.

Debug and AT command log

[AaronConvery]

I have narrowed it down, I am getting successful get request logs on my server side indicating the communication is happening between my ESP my server however there is something closing the TCP connection as soon as the get request is happening on the arduino side resulting in no result being output to the serial. The only logs it displays is the below 10:34:14.587 -> +CIPOPEN: 0,0 10:34:14.624 -> AT+CIPCLOSE=0 10:34:14.624 -> 10:34:14.624 -> OK 10:34:14.624 -> Failed to make GET request, error: -1