Hi all, I'm new to using esp(this is my first project actually) and I'm struggling to find out answer for my question.
I'm using the esp board to send data to rest api of my own deployed on AWS. The data sent is JSON.
If I use the onboard Wifi everything works fine , but when i use gprs the server doesn't respond and here isPreformatted text my codePreformatted text for this:
// Your GPRS credentials (leave empty, if not needed)
const char apn[] = "internet.apn"; // APN (example: internet.vodafone.pt) use https://wiki.apnchanger.org
const char gprsUser[] = ""; // GPRS User
const char gprsPass[] = ""; // GPRS Password
// SIM card PIN (leave empty, if not defined)
const char simPIN[] = "0000";
// Server details
// The server variable can be just a domain name or it can have a subdomain. It depends on the service you are using
const char server[] = "20.43.**.**"; // domain name: example.com, maker.ifttt.com, etc
const char resource[] = "/api/v1/position_data"; // resource path, for example: /post-data.php
const int port = 443; // server port number
// TTGO T-Call pins
#define MODEM_RST 5
#define MODEM_PWKEY 4
#define MODEM_POWER_ON 23
#define MODEM_TX 27
#define MODEM_RX 26
#define I2C_SDA 21
#define I2C_SCL 22
// Set serial for debug console (to Serial Monitor, default speed 115200)
#define SerialMon Serial
// Set serial for AT commands (to SIM800 module)
#define SerialAT Serial1
// Configure TinyGSM library
#define TINY_GSM_MODEM_SIM800 // Modem is SIM800
#define TINY_GSM_RX_BUFFER 1024 // Set RX buffer to 1Kb
// Define the serial console for debug prints, if needed
//#define DUMP_AT_COMMANDS
#include <Wire.h>
#include <TinyGsmClient.h>
#ifdef DUMP_AT_COMMANDS
#include <StreamDebugger.h>
StreamDebugger debugger(SerialAT, SerialMon);
TinyGsm modem(debugger);
#else
TinyGsm modem(SerialAT);
#endif
// I2C for SIM800 (to keep it running when powered from battery)
TwoWire I2CPower = TwoWire(0);
// TinyGSM Client for Internet connection
TinyGsmClient client(modem);
#define uS_TO_S_FACTOR 1000000UL /* Conversion factor for micro seconds to seconds */
#define TIME_TO_SLEEP 3600 /* Time ESP32 will go to sleep (in seconds) 3600 seconds = 1 hour */
#define IP5306_ADDR 0x75
#define IP5306_REG_SYS_CTL0 0x00
bool setPowerBoostKeepOn(int en){
I2CPower.beginTransmission(IP5306_ADDR);
I2CPower.write(IP5306_REG_SYS_CTL0);
if (en) {
I2CPower.write(0x37); // Set bit1: 1 enable 0 disable boost keep on
} else {
I2CPower.write(0x35); // 0x37 is default reg value
}
return I2CPower.endTransmission() == 0;
}
void setup() {
// Set serial monitor debugging window baud rate to 115200
SerialMon.begin(115200);
// Keep power when running from battery
bool isOk = setPowerBoostKeepOn(1);
SerialMon.println(String("IP5306 KeepOn ") + (isOk ? "OK" : "FAIL"));
// Set modem reset, enable, power pins
pinMode(MODEM_PWKEY, OUTPUT);
pinMode(MODEM_RST, OUTPUT);
pinMode(MODEM_POWER_ON, OUTPUT);
digitalWrite(MODEM_PWKEY, LOW);
digitalWrite(MODEM_RST, HIGH);
digitalWrite(MODEM_POWER_ON, HIGH);
// Set GSM module baud rate and UART pins
SerialAT.begin(115200, SERIAL_8N1, MODEM_RX, MODEM_TX);
delay(3000);
// Restart SIM800 module, it takes quite some time
// To skip it, call init() instead of restart()
SerialMon.println("Initializing modem...");
modem.restart();
// use modem.init() if you don't need the complete restart
// Unlock your SIM card with a PIN if needed
if (strlen(simPIN) && modem.getSimStatus() != 3 ) {
modem.simUnlock(simPIN);
}
// Configure the wake up source as timer wake up
esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
}
void loop() {
SerialMon.print("Connecting to APN: ");
SerialMon.print(apn);
if (!modem.gprsConnect(apn, gprsUser, gprsPass)) {
SerialMon.println(" fail");
}
else {
SerialMon.println(" OK");
SerialMon.print("Connecting to ");
SerialMon.print(server);
if (!client.connect(server, port)) {
SerialMon.println(" fail");
}
else {
SerialMon.println(" OK");
// Making an HTTP POST request
SerialMon.println("Performing HTTP POST request...");
// Prepare your HTTP POST request data
String httpRequestData = "{\"latitude\":\"5656\",\"longitude\":\"5656\",\"altitude\":\"5656\",\"speed\":\"5656\",\"deviceId\":\"111112222200000\"}";
client.print(String("POST ") + resource + " HTTP/1.1\r\n");
client.print(String("Host: ") + server + "\r\n");
client.println("Connection: close");
client.println("Content-Type: application/json");
client.print("Content-Length: ");
client.println(httpRequestData.length());
client.println();
client.println(httpRequestData);
unsigned long timeout = millis();
while (client.connected() && millis() - timeout < 10000L) {
// Print available data (HTTP response from server)
while (client.available()) {
char c = client.read();
SerialMon.print(c);
timeout = millis();
}
}
SerialMon.println();
// Close client and disconnect
client.stop();
SerialMon.println(F("Server disconnected"));
modem.gprsDisconnect();
SerialMon.println(F("GPRS disconnected"));
}
}
// Put ESP32 into deep sleep mode (with timer wake up)
esp_deep_sleep_start();
}
I successfully connect to the mobile network. The difference here is that I had to use the IP address of my server in order to connect to it. I've I used the URL as the one in the Wifi code but it never connects to the server. So I connect to the server as well but when I try to post JSON to the api endpoint nothing happens and there is no error as well. So my best guess is that the problem is somewhere aroung here:
// Making an HTTP POST request
SerialMon.println("Performing HTTP POST request...");
// Prepare your HTTP POST request data
String httpRequestData = "{\"latitude\":\"5656\",\"longitude\":\"5656\",\"altitude\":\"5656\",\"speed\":\"5656\",\"deviceId\":\"111112222200000\"}";
client.print(String("POST ") + resource + " HTTP/1.1\r\n");
client.print(String("Host: ") + server + "\r\n");
client.println("Connection: close");
client.println("Content-Type: application/json");
client.print("Content-Length: ");
client.println(httpRequestData.length());
client.println();
client.println(httpRequestData);
This is Serial output
Initializing modem...
Connecting to APN: internet.a1.bg OK
Connecting to 20.43.**.** OK
Performing HTTP POST request...
Server disconnected
GPRS disconnected
Can anyone help me please .