ESP32 Forum

Code: Select all

String GetBigFile(){
	WiFiClient thisClient;
	IPAddress thisHost(192, 168, 1, 10);
	char thisPath[]="/testBigFile.ino.esp32.bin"; //Big = about 800k OTA bin file
	String thisPart, theseHeaders, thisBody;
	if(!thisClient.connect(thisHost, 8465)){
		Serial.println("Connection Failed");
		return "{\"Error\":\"Connection Failed\"}";
	}
	Serial.println(thisPath);
	Serial.println(String(thisPath));
	Serial.println("Connection succeeded");
	Serial.print("thisClient.available(): ");
	Serial.println(thisClient.available());
	String thisReq=String("GET ") + String(thisPath) + " HTTP/1.1\r\n" +
		"Host: 192.168.1.10:8465\r\n" +
		"Cache-Control: no-cache\r\n" +
		"Connection: close\r\n\r\n";
	Serial.println("thisReq: " + thisReq);
	thisClient.print(thisReq);
	unsigned long timeout = millis();
	while(thisClient.available()==0) {
		if(millis()-timeout > 5000){
			Serial.println("Client timed out");
			thisClient.stop();
			Serial.println("Client timed out");
			return "{\"Error\":\"Client timed out\"}";
			
		}
	}
	Serial.println("Headers Begin");
	thisPart="Header";
	while(thisClient.available()){
		Serial.println(thisClient.available());
		if(thisPart=="Header"){
			String thisLine=thisClient.readStringUntil('\n');
			theseHeaders.concat(thisLine);
			thisLine.trim();
			if(!thisLine.length()){
				Serial.println("Headers Complete:\n" + theseHeaders + "\n------\n");
				thisPart="Body";
			}
		}else{ //Error happens in this block, after about 50 successful character reads with delay
			char thisChar=thisClient.read();
			thisBody.concat(thisChar);
			//delay(10); //Tested at various durations to see if it adds to or frees up blocking.  It seems to add further blocking?
			//vTaskDelay(15); //Also tested, at various duration.
		}
	}
	Serial.println("Body Complete");
	thisClient.stop();
	return "{\"Headers\":\"" + theseHeaders + "\",\"Body\":\"" + thisBody + "\"}";
}

Code: Select all

#include <WiFi.h>
#include <Update.h>
#include "AsyncJson.h"
AsyncWebServer EspServer(80);
bool GetBigFileFlag=false; //This is the flag

void setup(){
	//[Code to set up server etc. here]
	EspServer.on("*", HTTP_POST, [](AsyncWebServerRequest * Req){
		AsyncWebParameter* keyVal=Req->getParam(0);
		String key=keyVal->name();
		String val=keyVal->value();
		if(key=="req" && val=="GetBigFile"){
			Serial.println("Updating...");
			Req->send(200, "text/plain", "Updating...");
			//GetBigFile(); //***** This is the mistake.  Blocks EspServer
			GetBigFileFlag=true; //Global flag instead, see main loop below.
		}else{
			Serial.println("Request ignored");
			Req->send(200, "text/plain", "Request ignored");
		}
	});
	EspServer.begin();
}

void GetBigFile(){
	//Etc. code to load the big file from remote server
}

void loop(){
	if(GetBigFileFlag) GetBigFile(); //Run GetBigFile from here instead of within EspServer.on() 
}