68 lines
No EOL
2.6 KiB
C++
68 lines
No EOL
2.6 KiB
C++
//************************************************************************************************************
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//
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// There are scores of ways to use asyncHTTPrequest. The important thing to keep in mind is that
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// it is asynchronous and just like in JavaScript, everything is event driven. You will have some
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// reason to initiate an asynchronous HTTP request in your program, but then sending the request
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// headers and payload, gathering the response headers and any payload, and processing
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// of that response, can (and probably should) all be done asynchronously.
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//
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// In this example, a Ticker function is setup to fire every 5 seconds to initiate a request.
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// Everything is handled in asyncHTTPrequest without blocking.
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// The callback onReadyStateChange is made progressively and like most JS scripts, we look for
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// readyState == 4 (complete) here. At that time the response is retrieved and printed.
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//
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// Note that there is no code in loop(). A code entered into loop would run oblivious to
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// the ongoing HTTP requests. The Ticker could be removed and periodic calls to sendRequest()
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// could be made in loop(), resulting in the same asynchronous handling.
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//
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// For demo purposes, debug is turned on for handling of the first request. These are the
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// events that are being handled in asyncHTTPrequest. They all begin with Debug(nnn) where
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// nnn is the elapsed time in milliseconds since the transaction was started.
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//
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//*************************************************************************************************************
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#include <ESP8266WiFi.h>
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#include <WiFiManager.h>
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#include <asyncHTTPrequest.h>
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#include <Ticker.h>
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WiFiManager wifiManager;
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asyncHTTPrequest request;
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Ticker ticker;
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void sendRequest(){
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if(request.readyState() == 0 || request.readyState() == 4){
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request.open("GET", "http://worldtimeapi.org/api/timezone/Europe/London.txt");
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request.send();
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}
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}
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void requestCB(void* optParm, asyncHTTPrequest* request, int readyState){
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if(readyState == 4){
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Serial.println(request->responseText());
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Serial.println();
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request->setDebug(false);
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}
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}
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void setup(){
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Serial.begin(115200);
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WiFi.setAutoConnect(true);
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WiFi.begin();
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while(WiFi.status() != WL_CONNECTED){
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wifiManager.setDebugOutput(false);
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wifiManager.setConfigPortalTimeout(180);
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Serial.println("Connecting with WiFiManager");
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wifiManager.autoConnect("ESP8266", "ESP8266");
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yield();
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}
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request.setDebug(true);
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request.onReadyStateChange(requestCB);
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ticker.attach(5, sendRequest);
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}
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void loop(){
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} |