#include <SoftwareSerial.h>
#define RX 10
#define TX 11
SoftwareSerial esp(RX, TX);

//cmd
int cTrCmd;
int cTmCmd;
boolean f = false;

//Wifi
String W_SSID = "TP-LINK_F1D01E";
String W_PASS = "4188370026563794";

//ThingSpeak
String API_KEY = "XMISMZZSMUYC33E9";
String THING_IP = "api.thingspeak.com";
String PORT = "80";



void setup() {
  Serial.begin(9600);
  esp.begin(115200);

  debug();
  connectWiFi();
}

void loop() {

  delay(13000);
  sendData();



}

void sendData() {
  sendCmd("AT+CIPMUX=1","OK");
  String cmd = "AT+CIPSTART=0,\"TCP\",\"" + THING_IP + "\"," + PORT;
  sendCmd(cmd, "OK");
  int i = random(100);
  String getMethod = "GET /update?key=" + API_KEY + "&field1=" + i + " \r\n";
  sendCmd("AT+CIPSEND=0," + String(getMethod.length() + 4), ">");
  sendCmd(getMethod);
  delay(2000);
  sendCmd("AT+CIPCLOSE=0", "OK");
}

void connectWiFi() {
  if (sendCmd("AT+CWMODE=1", "OK")) {
    Serial.println("----> Module mod set to Station");
  }
  if (sendCmd("AT+CWJAP=\"" + W_SSID + "\",\"" + W_PASS + "\"", "OK")) {
    Serial.println("----> Connected to WiFI: " + W_SSID);
  } else {
    Serial.println("----> Connection failed: " + W_SSID);
  }
}

void debug() {
  if (sendCmd("AT", "OK")) {
    Serial.println("----> Module connection DONE");
  } else {
    Serial.println("----> Module connection FAILED");
  }
}

boolean sendCmd(String cmd, char repl[]) {
  Serial.print(cTrCmd);
  Serial.print(". Command: " + cmd + " ");
  while (cTmCmd < 20) {
    esp.println(cmd);
    if (esp.find(repl)) {
      f = true;
      break;
    }
    cTmCmd++;
  }
  if (f == true) {
    Serial.println("DONE");
    cTrCmd++;
    cTmCmd = 0;
  }
  if (f == false) {
    Serial.println("FAIL");
    cTrCmd = 0;
    cTmCmd = 0;
  }
  boolean f_l = f;
  f = false;
  return f_l;
}
boolean sendCmd(String cmd) {
  Serial.print(cTrCmd);
  Serial.println(". Command: " + cmd + " ");
  esp.println(cmd);
  cTrCmd++;
}