Add HTTPS example code with AT commands

[dtheodor79]

Hi, I would to ask if possible, to add an example code that successfully configures the SIM7000 to perform an HTTPS connection.

I followed the exact steps described in the application code below at page 18, but I get ERROR when trying to connect to the server. https://www.simcom.com/technical_files.html?pro_cat=0&pro_li=10&time=0&filetype=0

Overall, it look like that there is a lot of ongoing work on the "TinyGSM" library side to integrate SIM7000 (with HTTPS), so I guess it would help a lot the SIM700G LilyGo users having an example code for now that uses AT commands to configure and perform HTTPS connections.

I have attached my code below.

/*
  FILE: AllFunctions.ino
  AUTHOR: Koby Hale
  PURPOSE: Test functionality
*/

#define TINY_GSM_MODEM_SIM7000
#define TINY_GSM_RX_BUFFER 1024 // Set RX buffer to 1Kb
#define SerialAT Serial1

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

/*
   Tests enabled
*/
#define TINY_GSM_TEST_GPRS    true
#define TINY_GSM_TEST_GPS     false
#define TINY_GSM_POWERDOWN    true

// set GSM PIN, if any
#define GSM_PIN ""

// Your GPRS credentials, if any
const char apn[]  = "webonly.vodafone.gr";     //SET TO YOUR APN
const char gprsUser[] = "";
const char gprsPass[] = "";

#include <TinyGsmClient.h>
#include <Ticker.h>
#include <ArduinoHttpClient.h>

#ifdef DUMP_AT_COMMANDS  // if enabled it requires the streamDebugger lib
#include <StreamDebugger.h>
StreamDebugger debugger(SerialAT, Serial);
TinyGsm modem(debugger);
#else
TinyGsm modem(SerialAT);
#endif

// Server details
const char server[]   = "vsh.pp.ua";
const char resource[] = "/TinyGSM/logo.txt";
const int  port       = 443;
//const int  port       = 80;

TinyGsmClient client(modem);
HttpClient http(client, server, port);

#define uS_TO_S_FACTOR 1000000ULL  // Conversion factor for micro seconds to seconds
#define TIME_TO_SLEEP  60          // Time ESP32 will go to sleep (in seconds)

#define UART_BAUD   9600
#define PIN_DTR     25
#define PIN_TX      27
#define PIN_RX      26
#define PWR_PIN     4

#define SD_MISO     2
#define SD_MOSI     15
#define SD_SCLK     14
#define SD_CS       13
#define LED_PIN     12

int counter, lastIndex, numberOfPieces = 24;
String pieces[24], input;

void setup() {
  // Set console baud rate
  Serial.begin(57600);
  delay(10);

  // Set LED OFF
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, HIGH);

  pinMode(PWR_PIN, OUTPUT);
  digitalWrite(PWR_PIN, HIGH);
  delay(300);
  digitalWrite(PWR_PIN, LOW);

  Serial.println("\nWait...");

  delay(3000);

  SerialAT.begin(UART_BAUD, SERIAL_8N1, PIN_RX, PIN_TX);

  // Restart takes quite some time
  // To skip it, call init() instead of restart()
  Serial.println("Initializing modem...");
  if (!modem.restart()) {
    Serial.println("Failed to restart modem, attempting to continue without restarting");
    modem.init();
  }

  String name = modem.getModemName();
  delay(500);
  Serial.println("Modem Name: " + name);

  String modemInfo = modem.getModemInfo();
  delay(500);
  Serial.println("Modem Info: " + modemInfo);

  // Set SIM7000G GPIO4 LOW ,turn off GPS power
  // CMD:AT+SGPIO=0,4,1,0
  // Only in version 20200415 is there a function to control GPS power
  modem.sendAT("+SGPIO=0,4,1,0");

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

  /*
    2 Automatic
    13 GSM only
    38 LTE only
    51 GSM and LTE only
  * * * */
  String res;
  do {
    res = modem.setNetworkMode(13);
    delay(500);
  } while (res != "OK");

  /*
    1 CAT-M
    2 NB-Iot
    3 CAT-M and NB-IoT
  * * */
  do {
    res = modem.setPreferredMode(1);
    delay(500);
  } while (res != "OK");

}

void loop() {
#if TINY_GSM_TEST_GPRS

  SerialAT.println("AT+CGDCONT?");
  delay(500);
  if (SerialAT.available()) {
    input = SerialAT.readString();
    for (int i = 0; i < input.length(); i++) {
      if (input.substring(i, i + 1) == "\n") {
        pieces[counter] = input.substring(lastIndex, i);
        lastIndex = i + 1;
        counter++;
      }
      if (i == input.length() - 1) {
        pieces[counter] = input.substring(lastIndex, i);
      }
    }
    // Reset for reuse
    input = "";
    counter = 0;
    lastIndex = 0;

    for ( int y = 0; y < numberOfPieces; y++) {
      for ( int x = 0; x < pieces[y].length(); x++) {
        char c = pieces[y][x];  //gets one byte from buffer
        if (c == ',') {
          if (input.indexOf(": ") >= 0) {
            String data = input.substring((input.indexOf(": ") + 1));
            if ( data.toInt() > 0 && data.toInt() < 25) {
              modem.sendAT("+CGDCONT=" + String(data.toInt()) + ",\"IP\",\"" + String(apn) + "\",\"0.0.0.0\",0,0,0,0");
            }
            input = "";
            break;
          }
          // Reset for reuse
          input = "";
        }
        else {
          input += c;
        }
      }
    }
  } else {
    Serial.println("Failed to get PDP!");
  }

  Serial.println("\n\n\nWaiting for network...");
  if (!modem.waitForNetwork()) {
    delay(10000);
    return;
  }

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

  Serial.println("\n---Starting GPRS TEST---\n");
  Serial.println("Connecting to: " + String(apn));
  if (!modem.gprsConnect(apn, gprsUser, gprsPass)) {
    delay(10000);
    return;
  }

  Serial.print("GPRS status: ");
  if (modem.isGprsConnected()) {
    Serial.println("connected");
  } else {
    Serial.println("not connected");
  }

  String ccid = modem.getSimCCID();
  Serial.println("CCID: " + ccid);

  String imei = modem.getIMEI();
  Serial.println("IMEI: " + imei);

  String cop = modem.getOperator();
  Serial.println("Operator: " + cop);

  IPAddress local = modem.localIP();
  Serial.println("Local IP: " + String(local));

  int csq = modem.getSignalQuality();
  Serial.println("Signal quality: " + String(csq));

  SerialAT.println("AT+CPSI?");     //Get connection type and band
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Setting SSL..");

  Serial.println("sslversion..");
  SerialAT.println("AT+CSSLCFG=\"sslversion\",1,3");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("enable SSL..");
  SerialAT.println("AT+SHSSL=1,\"\"");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("set URL..");
  SerialAT.println("AT+SHCONF=\"URL\",\"https://httpbin.org\"");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Set max body length..");
  SerialAT.println("AT+SHCONF=\"BODYLEN\",1024");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Set max header length..");
  SerialAT.println("AT+SHCONF=\"HEADERLEN\",350");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Connect HTTPS server..");
  SerialAT.println("AT+SHCONN");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Get HTTP status..");
  SerialAT.println("AT+SHSTATE?");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Clear HTTP header content..");
  SerialAT.println("AT+SHCHEAD");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Add header content 1..");
  SerialAT.println("AT+SHAHEAD=\"User-Agent\",\"curl/7.47.0\"");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Add header content 2..");
  SerialAT.println("AT+SHAHEAD=\"Cache-control\",\"no-cache\"");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Add header content 3..");
  SerialAT.println("AT+SHAHEAD=\"Connection\",\"keep-alive\"");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Add header content 4..");
  SerialAT.println("AT+SHAHEAD=\"Accept\",\"*/*\"");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Set request type is GET..");
  SerialAT.println("AT+SHREQ=\"/get?user=jack&password=123\",1");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  Serial.println("Read data length 388..");
  SerialAT.println("AT+SHREAD=0,388");
  delay(500);
  if (SerialAT.available()) {
    String r = SerialAT.readString();
    Serial.println(r);
  }

  // Shutdown

  http.stop();

  Serial.println("\n---End of GPRS TEST---\n");
#endif

#if TINY_GSM_TEST_GPRS
  modem.gprsDisconnect();
  if (!modem.isGprsConnected()) {
    Serial.println("GPRS disconnected");
  } else {
    Serial.println("GPRS disconnect: Failed.");
  }
#endif

#if TINY_GSM_TEST_GPS
  Serial.println("\n---Starting GPS TEST---\n");
  // Set SIM7000G GPIO4 HIGH ,turn on GPS power
  // CMD:AT+SGPIO=0,4,1,1
  // Only in version 20200415 is there a function to control GPS power
  modem.sendAT("+SGPIO=0,4,1,1");

  modem.enableGPS();
  float lat,  lon;
  while (1) {
    if (modem.getGPS(&lat, &lon)) {
      Serial.printf("lat:%f lon:%f\n", lat, lon);
      break;
    } else {
      Serial.print("getGPS ");
      Serial.println(millis());
    }
    delay(2000);
  }
  modem.disableGPS();

  // Set SIM7000G GPIO4 LOW ,turn off GPS power
  // CMD:AT+SGPIO=0,4,1,0
  // Only in version 20200415 is there a function to control GPS power
  modem.sendAT("+SGPIO=0,4,1,0");
  Serial.println("\n---End of GPRS TEST---\n");
#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();
  Serial.println("Poweroff.");
#endif

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

  // Do nothing forevermore
  while (true) {
    modem.maintain();
  }
}

Thanks, dtheodor

[Mr-HaleYa]

Tbh HTTPS is trash on the sim7000............... I've got it to work twice in the last 2 years I've worked on this......

HTTP works perfectly fine but HTTPS needs a secure handshake to connect and to do that you need a certificate and those expire every 30-90 days then you need a new one... as of right now HTTPS is kind of a no-go until they finish their work on the TinyGSM lib then ill make an example

[Mr-HaleYa]

@dtheodor79 @lewisxhe Should be closed