A9G GSM/GPRS module library for esp32

[ayazurrehman786]

Anyone can help with below code. I am using Tinygsm library for A9G with ESP32 and getting below error to connect to server. Other information is printing like module IMEI, module info...and also working on wifi client but not connecting to server on GSM Client.

` #define TINY_GSM_MODEM_A7

include

include

include

include

char ssid[] = "SSID"; // your SSID char pass[] = "Password"; // your SSID Password

// Your GPRS credentials const char apn[] = "cit-moi"; const char gprsUser[] = ""; const char gprsPass[] = "";

include

define DEBUG true

define BAUD_RATE 115200

include

include

define A9G_SIZE_RX 1024 // used in A9G.setRxBufferSize()

define data_BUFFER_LENGTH 1024

/***/

define A9G_PON 13 //ESP32 GPIO13 A9G POWON

define A9G_RST 12 //ESP32 GPIO12 A9G RESET

define A9G_WAKE 27 //ESP32 GPIO27 A9G WAKE

define A9G_LOWP 14 //ESP32 GPIO14 A9G ENTER LOW POWER MODULE

define A9G_TXD 35 //ESP32 GPIO35(RX), A9G TXD

define A9G_RXD 32 //ESP32 GPIO32(TX), A9G RXD

int A9GPOWERON();

String response = ""; HardwareSerial A9G(1); int WiFi_Count = 10; String payload; unsigned long previousMillis = 0; unsigned long interval = 30000;

ifdef DUMP_AT_COMMANDS

include

StreamDebugger debugger(A9G, Serial); TinyGsm modem(debugger);

else

// Initialize GSM modem TinyGsm modem(A9G);

endif

// Initialize GSM client TinyGsmClient client(modem); // Set to true, if modem is connected bool modemConnected = false;

const char server[] = "arduino.cc"; const char resource[] = "/"; const int port = 80; // port 80 is the default for HTTP

void setup() {

Serial.begin(115200); / Define baud rate for A9G communication / A9G.begin(9600, SERIAL_8N1, A9G_TXD, A9G_RXD); // RX and TX of ES32 A9G.setRxBufferSize(A9G_SIZE_RX);

WiFi.begin(ssid, pass); Serial.println(""); Serial.print("Connecting to WiFi"); // Wait for connection

while (WiFi.status() != WL_CONNECTED) { if (WiFi_Count > 0) { delay(500); Serial.print("."); WiFi_Count = WiFi_Count - 1; } else goto exit; } //If connection successful show IP address in serial monitor exit: if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status Serial.println(""); Serial.print("Connected to "); Serial.println(ssid); Serial.print("WiFi Signals:"); Serial.println(WiFi.RSSI()); Serial.print("WIFI Local IP:"); Serial.print(WiFi.localIP()); //IP address assigned to your ESP }

Serial.println("\nA9G Test Started...");

for (char ch = ' '; ch <= 'z'; ch++) { A9G.write(ch); } A9G.println(""); delay(500); // sendData("AT+RST=1", 1000, DEBUG); //Software reset // delay(500);

/****/ pinMode(A9G_PON, OUTPUT);//LOW LEVEL ACTIVE pinMode(A9G_RST, OUTPUT);//HIGH LEVEL ACTIVE pinMode(A9G_LOWP, OUTPUT);//LOW LEVEL ACTIVE

digitalWrite(A9G_PON, HIGH); // Keep A9G OFF(HIGH) initially digitalWrite(A9G_RST, LOW); digitalWrite(A9G_LOWP, HIGH);

Serial.println("Turning ON A9G..."); Serial.println();

if (A9GPOWERON() == 1) { Serial.println("A9G POWER ON."); Serial.println(); }

String modemInfo = modem.getModemInfo(); Serial.print(F("Modem: ")); Serial.println(modemInfo);

String modemIIMEI = modem.getIMEI(); Serial.print(F("IMEI: ")); Serial.println(modemIIMEI); }

void loop() { HTTPClient http; if (!modemConnected) { Serial.print(F("Waiting for network...")); if (!modem.waitForNetwork()) { Serial.println(" fail"); delay(1000); return; } Serial.println(" OK");

Serial.print(F("Connecting to "));
Serial.print(apn);
if (!modem.gprsConnect(apn, gprsUser, gprsPass)) {
    Serial.println(" fail");
    delay(1000);
    return;
}

modemConnected = true;
Serial.println(" Success!");

}

// if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status // HTTPWiFi_Data(); // Serial.println("WiFi Data"); // JSON_Data(); // }

if(client.connect(server, port)) { Serial.println("Connected to server"); // Make a HTTP request: client.print("GET "); client.print(resource); client.println(" HTTP/1.0"); client.println(); } else { Serial.println("connection failed"); } }

void HTTPWiFi_Data() {

HTTPClient http; //Declare an object of class HTTPClient

String Rec_URL = "http://apk.vehtechs.com/api/imei?imei=123456789456789";

Serial.println(Rec_URL); Serial.println();

http.begin(Rec_URL); //Specify request destination int httpResponseCode = http.GET(); //Send the request

if (httpResponseCode > 0) { //Check the returning code Serial.print("HTTP Response code: "); Serial.println(httpResponseCode); payload = http.getString(); //Get the request response payload Serial.println(payload); //Print the response payload Serial.println(); Serial.println(); } else { Serial.print("Error code: "); Serial.println(httpResponseCode); } http.end(); //Close connection }

void JSON_Data() { StaticJsonDocument<512> doc; DeserializationError error = deserializeJson(doc, payload);

if (error) { Serial.print("deserializeJson() failed: "); Serial.println(error.c_str()); //return; } else { const char isArm = doc["isArm"]; // "1" const char wifi = doc["wifi"]; // "0" const char wifi_password = doc["wifi_password"]; // nullptr const char wifi_connssid = doc["wifi_connssid"]; // "0" int wifi_disconnect = doc["wifi_disconnect"]; // 0 const char wifi_disc_name = doc["wifi_disc_name"]; // nullptr int engine = doc["engine"]; // 1 const char phoneNumber = doc["phoneNumber"]; // "542351685" const char number1 = doc["number1"]; // nullptr const char number2 = doc["number2"]; // nullptr const char number3 = doc["number3"]; // nullptr const char number4 = doc["number4"]; // nullptr const char number5 = doc["number5"]; // nullptr const char gyro = doc["gyro"]; // "0" const char gps = doc["gps"]; // "1" const char powerSupply = doc["powerSupply"]; // "1" const char* plateNo = doc["plateNo"]; // "32568" Serial.print("isArm= "); Serial.println(isArm); Serial.print("wifi= "); Serial.println(wifi); Serial.print("wifi_password= "); Serial.println(wifi_password); Serial.print("wifi_connssid= "); Serial.println(wifi_connssid); Serial.print("wifi_disconnect= "); Serial.println(wifi_disconnect); Serial.print("wifi_disc_name= "); Serial.println(wifi_disc_name); Serial.print("engine= "); Serial.println(engine); Serial.print("phoneNumber= "); Serial.println(phoneNumber); Serial.print("number1= "); Serial.println(number1); Serial.print("number2= "); Serial.println(number2); Serial.print("number3= "); Serial.println(number3); Serial.print("number4= "); Serial.println(number4); Serial.print("number5= "); Serial.println(number5); Serial.print("gyro= "); Serial.println(gyro); Serial.print("gps= "); Serial.println(gps); Serial.print("powerSupply= "); Serial.println(powerSupply); Serial.print("plateNo= "); Serial.println(plateNo); Serial.println(); Serial.println(); Serial.println(); } delay(500); }

String sendData(String command, const int timeout, boolean debug) { String response = ""; Serial.print("Command Sent: "); Serial.println(command); A9G.println(command);

unsigned long time = millis(); while (A9G.available() == 0) {}

while (A9G.available()) { char c = A9G.read(); response += c; // Serial.print(c); delay(5); }

if (debug) { Serial.println(); Serial.print("A9G Response: "); Serial.println(response); }

if (response.indexOf('{') > 0) { int l = response.indexOf('{'); String res = response.substring(l); // Serial.println(res); response = res; } return response; }

int A9GPOWERON() //Send Command to A9G to Turn ON { digitalWrite(A9G_PON, LOW); delay(3000); digitalWrite(A9G_PON, HIGH); delay(5000); String msg = String(""); label: msg = sendData("AT", 2000, DEBUG); if ( msg.indexOf("OK") >= 0 ) { Serial.println("GET OK"); Serial.println(); return 1; } else { Serial.println("NOT GET OK"); Serial.println(); goto label; //If NOT GET OK GOTO label return 0; } } `

This is the data from Serial Monitor:

23:36:19.953 -> 23:36:19.953 -> Connecting to WiFi.......... 23:36:24.955 -> A9G Test Started... 23:36:25.474 -> Turning ON A9G... 23:36:25.474 -> 23:36:33.459 -> Command Sent: AT 23:36:33.504 -> 23:36:33.504 -> A9G Response: 23:36:33.504 -> OK 23:36:33.504 -> 23:36:33.504 -> GET OK 23:36:33.504 -> 23:36:33.504 -> A9G POWER ON. 23:36:33.504 -> 23:36:33.557 -> Modem: Ai_Thinker_Co._Ltd. A9/A9G V02.02.20190915R 23:36:33.627 -> IMEI: 867959034845080 23:36:33.627 -> Waiting for network... OK 23:36:33.655 -> Connecting to cit-moi fail 23:36:37.158 -> Waiting for network... OK 23:37:16.246 -> Connecting to cit-moi Success! 23:38:31.483 -> connection failed 23:39:47.529 -> connection failed

[praxnax]

Hi, are you still working on the project? Would be helpful if you can kindly email me on pranavprashar140@gmail.com , I am trying the same project (A9G Board with ESP32 Wroom 32) but facing problem in interfacing the two. I am powering both ESP 32 and A9G with USB Supply.

[a-3isa]

Hi , can you help me i am trying to interface A9 with ESP32c3 ?

[Mukund2900]

@a-3isa @praxnax @ayazurrehman786 did this work somehow ? Getting the netwrok establised ?

I tried this

#define TINY_GSM_MODEM_A7
#include <TinyGsmClient.h>

// Set your APN
const char apn[]  = "airtelgprs.com";  // type your APN
const char user[] = "";                // Leave empty if not required
const char pass[] = "";                // Leave empty if not required

// Server details
const char server[] = "dummy.restapiexample.com";
const int port = 80; // HTTP port

TinyGsm modem(Serial2);                // Use Serial2 for communication with A9G
TinyGsmClient client(modem);

void setup() {
  Serial.begin(115200);
  delay(500);
  Serial.println("\nInitializing modem...");
  Serial2.begin(115200);               // Initialize Serial2
  delay(2000);

  // Initialize modem using TinyGsm
  Serial.println("Initializing modem using TinyGsm...");
  if (!modem.restart()) {
    Serial.println("Failed to restart modem, attempting to initialize...");
    if (!modem.init()) {
      Serial.println("Failed to initialize modem, please check your connections and reset the board.");
      while (true);
    }
  }

  Serial.println("Modem initialized");

  Serial.println("Connecting to network...");
  if (!modem.waitForNetwork()) {
    Serial.println("Network connection failed");
    while (true);
  }

  Serial.println("Network connected");

  Serial.println("Connecting to GPRS...");
  if (!modem.gprsConnect(apn, user, pass)) {
    Serial.println("GPRS connection failed");
    while (true);
  }

  Serial.println("GPRS connected");
  makeHttpRequest();
}

void loop() {
  // Your code to use the internet connection goes here
}

void makeHttpRequest() {
  Serial.println("Connecting to server...");
  if (!client.connect(server, port)) {
    Serial.println("Connection to server failed");
    return;
  }

  Serial.println("Connected to server, sending GET request...");

  // Make an HTTP GET request
  client.println("GET /api/v1/employees HTTP/1.1");
  client.println("Host: dummy.restapiexample.com");
  client.println("Connection: close");
  client.println();

  // Read all the lines of the reply from server and print them to Serial
  while (client.connected() || client.available()) {
    if (client.available()) {
      String line = client.readStringUntil('\n');
      Serial.println(line);
    }
  }

  // Close the connection
  client.stop();
  Serial.println("HTTP request sent, connection closed");
}

But all it gives is Modem initialized Connecting to network... Network connection failed

Restart did happen but network is not getting established