Arduino and Android bidirectional communication. Android sends "ON" or "OFF". Arduino returns LED status of "LED:ON" or "LED:OFF". Here's sample code visit: http://makers-with-myson.blog.so-net.ne.jp/2016-03-01 *Arduino #include <ESP8266WiFi.h;> const char* ssid = "your ssid"; const char* password = "your password"; const int LED = 16; WiFiServer server(8080); WiFiClient client; void connectWiFi(const char* ssid ,const char* password) { WiFi.disconnect(); WiFi.mode(WIFI_STA); WiFi.begin(ssid ,password); while (WiFi.status() != WL_CONNECTED) { delay(100); Serial.print("."); } Serial.println(); Serial.println("WiFi connected"); Serial.print("IP address: "); Serial.println(WiFi.localIP()); } void setup() { Serial.begin(115200); connectWiFi(ssid ,password); server.begin(); client = server.available(); pinMode(LED ,OUTPUT); } void loop() { while ((WiFi.status() != WL_CONNECTED)) { connectWiFi(ssid ,password); } while (!client) { client = server.available(); delay(10); } while (!client.available()) { delay(10); } Serial.println("client connected"); String res = client.readStringUntil('\n'); Serial.println(res); client.flush(); if (res.equals("ON")) { digitalWrite(LED ,HIGH); client.print("LED:ON"); Serial.println("on"); } else if (res.equals("OFF")) { digitalWrite(LED ,LOW); client.print("LED:OFF"); Serial.println("off"); } else { Serial.println("ERROR"); client.print("error"); Serial.println("error"); } client.stop(); } Here's a client communication part of Android code. public class AsyncSendSocket extends AsyncTask<String;, Void, String> { private String mIpAddress = null; private Integer mPortNo = 0; private TextView mText = null; public AsyncSendSocket(String ipStr, String portStr ,TextView status) { mIpAddress = ipStr; mPortNo = Integer.parseInt(portStr); mText = status; } protected String doInBackground(String... params) { String data = ""; try { Socket socket = new Socket(mIpAddress, mPortNo); OutputStream out = socket.getOutputStream(); Scanner in = new Scanner(socket.getInputStream()); out.write(params[0].getBytes()); out.flush(); while(!in.hasNextLine()); do { data += in.nextLine(); } while (in.hasNextLine()); out.close(); in.close(); socket.close(); return data; } catch (IOException e) { e.printStackTrace(); return "Output Failure"; } } protected void onPostExecute(String s) { mText.setText(s); } }

• published: 01 Mar 2016
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