ArduinoWebSockets + android app - Cant get sockets to work!
Posted: Wed Jan 03, 2018 2:20 pmI am creating a android client app to communicate with an ESp8266 connected to an Arduino. I can't seem to get the socket to pass data to the ESP. I am using Android studio to write the client app and when debugging it shows as the socket being connected but when I send data to the socketserver(ESP8266-01) I get no response and there is nothing being printed out on the serial monitor connected to the ESP. Attached is the ESP code which I am programming through the arduino IDE.
And below is the ASync task from the Android code:
I have been banging my head for a couple of days on this and can't figure out why the socket is not sending data to the ESP8266 or vice versa. Just a side note I connected my PC to the ESP and typed in 192.168.4.1:81/**** and I got a response back "This is only a Socket Server". So I know the Socket server is up and running. As I am a noob to both ESP and Android any help would be greatly appreciated.
Code: Select all
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <WebSocketsServer.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <Hash.h>
//ESP8266WiFiMulti WiFiMulti;
ESP8266WebServer server = ESP8266WebServer(80);
WebSocketsServer webSocket = WebSocketsServer(81);
void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length) {
switch(type) {
case WStype_DISCONNECTED:
Serial.printf("[%u] Disconnected!\n", num);
break;
case WStype_CONNECTED: {
IPAddress ip = webSocket.remoteIP(num);
Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\n", num, ip[0], ip[1], ip[2], ip[3], payload);
// send message to client
webSocket.sendTXT(num, "Connected");
}
break;
case WStype_TEXT:
IPAddress ip = webSocket.remoteIP(num);
Serial.printf("$%s?\n", payload);
webSocket.sendTXT(num, payload,sizeof(payload),false);
break;
}
}
void setup() {
//Serial.begin(921600);
Serial.begin(115200);
//Serial.setDebugOutput(true);
Serial.println();
Serial.println();
Serial.println();
for(uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] BOOT WAIT %d...\n", t);
Serial.flush();
delay(1000);
}
Serial.println("Starting AP");
WiFi.mode(WIFI_AP);
WiFi.softAP("Alpine_SIM_CNTRL","12345678");
Serial.println("AP Started");
//while(WiFiMulti.run() != WL_CONNECTED) {
//delay(100);
//Serial.println("Delayed");
//}
Serial.println("Starting Socket");
// start webSocket server
webSocket.begin();
webSocket.onEvent(webSocketEvent);
Serial.println("Socket Started");
if(MDNS.begin("simcontrol")) {
Serial.println("MDNS responder started");
}
Serial.println("Starting Server");
//handle index
server.on(
"/", []() {
server.send(200,"text/plain","You are connected");
});
server.begin();
Serial.println("Server Started");
//Add service to MDNS
MDNS.addService("http", "tcp", 80);
MDNS.addService("ws", "tcp", 81);
}
void loop() {
webSocket.loop();
server.handleClient();
}And below is the ASync task from the Android code:
Code: Select all
public class WriteToServer extends AsyncTask<MyTaskParams, Void, String> {
Context context;
Socket socket;
public WriteToServer(MyTaskParams Params) {
}
@Override
protected String doInBackground(MyTaskParams... params) {
socket = null;
DataInputStream in = null;
DataOutputStream out = null;
context = params[0].context;
String command = params[0].cmd;
String response = null;
try {
socket = new Socket("192.168.4.1",81);
out = new DataOutputStream(socket.getOutputStream());
in = new DataInputStream(socket.getInputStream());
out.writeUTF(command);
Log.i("Command","Command sent: " + command);
while(in.available() > 0) {
response = in.readUTF();
}
} catch (IOException e) {
e.printStackTrace();
Log.e("Error","There was an error writing to the socket. Thrown IO exception");
}finally {
if(socket != null){
try{
Log.i("INFO","closing the socket");
socket.close();
}catch(IOException e){
e.printStackTrace();
}
}
if(in != null){
try{
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(out != null){
try{
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return response;
}]I have been banging my head for a couple of days on this and can't figure out why the socket is not sending data to the ESP8266 or vice versa. Just a side note I connected my PC to the ESP and typed in 192.168.4.1:81/**** and I got a response back "This is only a Socket Server". So I know the Socket server is up and running. As I am a noob to both ESP and Android any help would be greatly appreciated.
