noblock async http

async.cpp

#include "esp32-hal-gpio.h"
#include <Arduino.h>
#include <WiFi.h>
#include <asyncHTTPrequest.h>

asyncHTTPrequest request;
unsigned long lastReq = 0;
const unsigned long interval = 5000;

void requestCB(void* optParm, asyncHTTPrequest* request, int readyState) {
    // readyState 4 = Header and Body received
    if (readyState == 4) {
        Serial.printf("Response Code: %d\n", request->responseHTTPcode());
    }
}

void setup() {
    Serial.begin(9600);
    WiFi.begin("xxxx 2.4G", "xxx");

    // Don't do anything until WiFi is solid
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("\nWiFi Connected");

    // Setup the callback
    request.onReadyStateChange(requestCB);

	pinMode(2, OUTPUT);
}

void loop() {
    // 1. Handle the LED (Zero blocking)
    static unsigned long ledPrev = 0;
    if (millis() - ledPrev > 100) {
        ledPrev = millis();
        digitalWrite(2, !digitalRead(2));
    }

    // 2. Trigger the Request (Zero blocking)
    // Only trigger if the previous one is finished (readyState 0 or 4)
    if (millis() - lastReq > interval) {
        if (request.readyState() == 0 || request.readyState() == 4) {
            lastReq = millis();
            if (request.open("POST", "http://192.168.100.7:8888")) {
		request.setReqHeader("Content-Type", "text/plain");
                request.send("POSTED ??? ");
            }
        }
    }
}