I recently received my first ESP8266 board
My ESP8266 successfully connects to my local private network (DHCP internet box serving 192.168.0.x IPs)
My goal is to make my ESP8266 call a home made REST API on my RASPBERRY (the two devices are in my local private network) using the ESP8266HTTPClient library and HTTPClient class.
I'm developping with Arduino IDE, and I'm able to compile then upload bin to my ESP8266 and finally see what happen with the COM monitor.
All should be fine, but I have two problems.
1)
My ESP8266 cannot request my local network's devices , I got a -1 / connection refused error when using my Raspberry hostname or IP (192.168.0.103)
But my ESP8266 can successfully make HTTP GET requests to my Raspberry through my external hostname synology address (with correct NAT/PATH rule) !
The odd thing is that I have the inverse situation with my Windows 7 laptop : I cannot request the external URL (loopback issue ?!), but I can request my Raspberry locally !
2)
Even if I successfully manage to HTTP GET my Raspberry with my external hostname, I got a lot of random -2 / "send header failed" errors
Here is a COM monitor output sample where you can see a good responde (http 200) and a lot of random -2 returns :
Code: Select all
[HTTP] begin for floriandrevet.synology.me...
[HTTP] GET... code: 200 (try=0)
{"Description":"nHome Domotic Rest Api","Version":"1.0.0.0"}{"Description":"nHome Domotic Rest Api","Version":"1.0.0.0"}
[HTTP] begin for floriandrevet.synology.me...
[HTTP] GET... failed, error: -2
[HTTP] GET... failed, error: -2
[HTTP] GET... failed, error: -2
[HTTP] begin for floriandrevet.synology.me...
[HTTP] GET... failed, error: -2
[HTTP] GET... code: 200 (try=1)
{"Description":"nHome Domotic Rest Api","Version":"1.0.0.0"}{"Description":"nHome Domotic Rest Api","Version":"1.0.0.0"}
[HTTP] begin for floriandrevet.synology.me...
[HTTP] GET... code: 200 (try=0)
Here is the code :
Code: Select all
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#define USE_SERIAL Serial
ESP8266WiFiMulti WiFiMulti;
HTTPClient http;
void setup() {
USE_SERIAL.begin(115200);
delay(10);
WiFiMulti.addAP("*****", "*****");
void loop() {
// wait for WiFi connection
if((WiFiMulti.run() == WL_CONNECTED))
{
doRequest("myserver", 80, "/api/get/description");
}
delay(5000);
}
void doRequest(String server, const int port, String url)
{
USE_SERIAL.print("[HTTP] begin for " + server + "...\n");
bool resultOk = false;
int maxTries = 3;
int currentTries = 0;
// configure traged server and url
http.begin(server, port, url); //HTTP
while(!resultOk && currentTries < maxTries)
{
// start connection and send HTTP header
int httpCode = http.GET();
if(httpCode > 0)
{
// HTTP header has been send and Server response header has been handled
USE_SERIAL.printf("[HTTP] GET... code: %d (try=%d)\n", httpCode, currentTries);
// file found at server
if(httpCode == 200)
{
String payload = http.getString();
USE_SERIAL.println(payload);
resultOk = true;
}
}
else
{
USE_SERIAL.printf("[HTTP] GET... failed, error: %d\n", httpCode);
}
if (!resultOk)
{
delay(500);
currentTries++;
}
}
http.end();
}
The situation is very frustrating, any help wil lbe appreciated !!
Best regards;
Florian