I have connected ESP8266 to my Raspberry Pi's WiFi network and assigned a static IP.

My Arduino code

#include "SoftwareSerial.h"String ssid = "Rpi";String password = "raspberry";SoftwareSerial esp(3, 2);// RX, TXString server = "192.168.50.1"; //my Hostvoid setup() {  esp.begin(115200);  Serial.begin(115200);  connectWifi();  httpget();  delay(1000);}void connectWifi() {  String cmd = "AT+CWJAP=\"" + ssid + "\",\"" + password + "\"";  esp.println(cmd);  delay(4000);  if (esp.find("OK")) {    Serial.println("Connected!");  }  else {    Serial.println("Cannot connect to wifi ! Connecting again...");  }  connectWifi();}/////////////////////////////GET METHOD///////////////////////////////void httpget() {  esp.println("AT+CIPSTART=\"TCP\",\"" + server + "\",1234");//start a TCP connection.  if ( esp.find("OK")) {    Serial.println("TCP connection ready");  }  delay(1000);  /*    String getRequest =    "GET " + uri + " HTTP/1.0\r\n" +    "Host: " + server + "\r\n" +    "Accept: *" + "/" + "*\r\n" +    "Content-Type: application/json\r\n" +    "\r\n";  */  String sendCmd = "AT+CIPSEND=";  esp.print(sendCmd);  //esp.println(getRequest.length() );  delay(500);  if (esp.find(">")) {    Serial.println("Sending..");    //  esp.print(getRequest);    if ( esp.find("SEND OK")) {      Serial.println("Packet sent");      while (esp.available()) {        String response = esp.readString();      }      esp.println("AT+CIPCLOSE");    }  }}void loop() {  httpget();}

I get this message

Cannot connect to wifi ! Connecting again...

In my Raspberry Pi I am constantly sending a signal to this IP address.

import socketTCP_IP = '192.168.50.1' #Local HostTCP_PORT = 1234            #Listening PortBUFFER_SIZE = 12SERVER_IP = '192.168.50.18'  #Arduino IPSERVER_PORT = 3007            #Server Ports = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)s.bind((TCP_IP,TCP_PORT))#s.listen(1)#(conn,addr) = s.accept()#print 'Connection address: ',addrwhile True:    print 'Sending message'    s.sendto('1',(SERVER_IP,SERVER_PORT))    print 'Waiting for response'    data,addr = s.recvfrom(BUFFER_SIZE)    if not data: break    print 'received data: ',data    print 'data recieved from: ',addr    conn.close()s.close()

But I can not see it in my Serial Monitor. Do I need to create a separate program for getting from WiFi?

• you didn't start a server on esp8266 so nothing listens on esp for signals from raspberry

  Juraj

  – Juraj♦

  2017-12-23 19:21:15 +00:00

  CommentedDec 23, 2017 at 19:21
• did you change the wifi mode in esp? it is in AP mode at default

  Juraj

  – Juraj♦

  2017-12-23 19:22:47 +00:00

  CommentedDec 23, 2017 at 19:22
• softwareserial at 115200 has errors

  Juraj

  – Juraj♦

  2017-12-23 19:23:18 +00:00

  CommentedDec 23, 2017 at 19:23

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