COAP Server

COAP on ESP8266

源自於 http://www.ikanbilis.com/362.php

COAP (constrained Application Protocol) is a protocol for limited resourced IOT devices like Arduino and ESP8266 to exhange data in Client-Server method.

Steps:
1) Download library from https://github.com/automote/ESP-CoAP
2) Put the downloded folder in Arduino Library.
3) I am using Nodemcu 12E. Normal ESP8266 will work.
4) Get a Firefox version 53 and install plug-in named Copper.
5) https://addons.mozilla.org/en-US/firefox/addon/copper-270430
6) Connect a LED on D0 on Nodemcu.
7) Upload the coapserver.ino to Nodemcu
8) Type 1 in outgoing panel and click PUT
9) A return string PUT Ok appear in incoming panel
10)The LED will on

/*

ESP-COAP Server

D0 = GPIO16;  D1 = GPIO5;   D2 = GPIO4;  D3 = GPIO0;

D4 = GPIO2;   D5 = GPIO14;  D6 = GPIO12; D7 = GPIO13;

D8 = GPIO15;  D9 = GPIO3;   D10 = GPIO1; LED_BUILTIN = GPIO16 (auxiliary constant for the board LED, not a board pin);

*/

#include <ESP8266WiFi.h>

#include <coap_server.h>

// CoAP server endpoint url callback

void callback_light(coapPacket &packet, IPAddress ip, int port, int obs);

void callback_lightled(coapPacket &packet, IPAddress ip, int port,int obs);

coapServer coap;

//WiFi connection info

const char* ssid = "74170287";

const char* password = "24063173";

// LED STATE

bool LEDSTATE;

// CoAP server endpoint URL

void callback_light(coapPacket *packet, IPAddress ip, int port,int obs) {

  Serial.print("light");

  // send response

  char p[packet->payloadlen + 1];

  memcpy(p, packet->payload, packet->payloadlen);

  p[packet->payloadlen] = NULL;

  Serial.println(p);

  String message(p);

  Serial.println(p);

  if (message.startsWith("0"))

  {

    digitalWrite(5,LOW);

    Serial.println("if loop");

  }

  else if (message.startsWith("1"))

  {

    digitalWrite(5,HIGH);

    Serial.println("else loop");

  } 

  

  char *light = (digitalRead(5) > 0)? ((char *) "1") :((char *) "0");

  

   //coap.sendResponse(packet, ip, port, light);

   if(obs==1)

    coap.sendResponse(light);

   else

    coap.sendResponse(ip,port,light);

}

void callback_lightled(coapPacket *packet, IPAddress ip, int port,int obs) {

  Serial.print("Lightled");

  // send response

  char p[packet->payloadlen + 1];

  memcpy(p, packet->payload, packet->payloadlen);

  p[packet->payloadlen] = NULL;

  String message(p);

  if (message.startsWith("0"))

    LEDSTATE = false;

  else if (message.startsWith("1"))

    LEDSTATE = true;

  if (LEDSTATE) {

    digitalWrite(5, HIGH) ;

    Serial.println("LED=high");

    if(obs==1)

     coap.sendResponse("1");

     else

    coap.sendResponse(ip, port, "1");

    

    //coap.sendResponse("1");

  } else {

    digitalWrite(5, LOW) ;

    Serial.println("LED=low");

    if (obs==1)

    coap.sendResponse("0");

    else

    coap.sendResponse(ip, port, "0");

    //coap.sendResponse("0");

  }

}

void setup() {

  yield();

  //serial begin

  Serial.begin(115200);

  WiFi.begin(ssid, password);

  Serial.println(" ");

  // Connect to WiFi network

  Serial.println();

  Serial.println();

  Serial.print("Connecting to ");

  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    //delay(500);

    yield();

    Serial.print(".");

  }

  Serial.println("");

  Serial.println("WiFi connected");

  // Print the IP address

  Serial.println(WiFi.localIP());

  // LED State

  pinMode(16, OUTPUT);

  digitalWrite(16, HIGH);

  LEDSTATE = true;

  pinMode(5, OUTPUT);

  digitalWrite(5, HIGH);

  //LEDSTATE = true;

  // add server url endpoints.

  // can add multiple endpoint urls.

  coap.server(callback_light, "light");

  coap.server(callback_lightled, "lightled");

 // coap.server(callback_text,"text");

  // start coap server/client

  coap.start();

  // coap.start(5683);

}

void loop() {

  coap.loop();

  delay(1000);

}