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