****SOLVED****** UDP and HTTP client don't mix? http not delcared.

Projects Programming
1

SOLVED**
Background: HTTPclient http; was in a loop. It had to be global.

I wanted to have a program listen for UDP packet of a certain code and then GET a webpage (to sound an alarm). I pieced together almost everything from NodeMCUs "Authorization" sketch into my UDP sketch. It says 'http' is not declared. It's not my includes, I ruled those out already.

What is wrong?

#include <string.h>
#include <stdio.h>
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#define USE_SERIAL Serial

char* rPacket;
const char* ssid = "JMR";
const char* password = "";
int ix;

ESP8266WiFiMulti WiFiMulti;
WiFiUDP Udp;
long delayMS;
unsigned int localUdpPort = 8888;  // local port to listen on
char incomingPacket[255];  // buffer for incoming packets
char  replyPacket[] = "Hi there! Got the message :-)";  // a reply string to send back
const char newLine[2] = "\n";

void setup()
{
  Serial.begin(115200);
  Serial.println();

  Serial.printf("Connecting to %s ", ssid);

  USE_SERIAL.begin(115200);
  // USE_SERIAL.setDebugOutput(true);

  USE_SERIAL.println();
  USE_SERIAL.println();
  USE_SERIAL.println();

  for (uint8_t t = 4; t > 0; t--) {
    USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);
    USE_SERIAL.flush();
    delay(1000);
  }

  WiFi.mode(WIFI_STA);
  WiFiMulti.addAP("JMR", "crystal2965");

  IPAddress ip(192, 168, 1, 139);
  IPAddress gw(192, 168, 1, 254);
  IPAddress dns(192, 168, 1, 254);
  IPAddress sn(255, 255, 255, 0);
  WiFi.config(ip, gw, sn, dns);

  Udp.begin(localUdpPort);
  Serial.printf("Now listening at IP %s, UDP port %d\n", WiFi.localIP().toString().c_str(), localUdpPort);
}

void switchCode2(char* code) {
  int codei = atoi(code);
  switch (codei) {
    case 7004: openWeb(); //magnet break
  }
  rPacket = "R";
  rPacket = strcat(rPacket, code);
  // send back a reply, to the IP address and port we got the packet from
  Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
  Udp.write(rPacket);
  Udp.endPacket();

}
void loop()
{
  char* pack;
  char* token;

  if ((WiFiMulti.run() == WL_CONNECTED)) {
    HTTPClient http;
    USE_SERIAL.print("[HTTP] begin...\n");


    int packetSize = Udp.parsePacket();
    if (packetSize)
    {
      // receive incoming UDP packets
      //Serial.println("Received %d bytes from %s, port %d\n", packetSize, Udp.remoteIP().toString().c_str(), Udp.remotePort());
      int len = Udp.read(incomingPacket, 255);
      if (len > 0)
      {
        incomingPacket[len] = 0;
      }
      pack = incomingPacket;
      Serial.println(incomingPacket);

      //Packet Parse
      //Split packet into codes
      token = strtok(pack, newLine);
      switchCode2(token);
      while ( token != NULL ) {
        token = strtok(NULL, newLine);
        switchCode2(token);
      }
      if (millis() - delayMS > 1000) Serial.println(9102);
    }
  }
}

void openWeb() {
  USE_SERIAL.print("[HTTP] begin...\n");
  // configure traged server and url
  http.begin("http://mat00gs@192.168.1.71:15080/admin?profile=6");
  USE_SERIAL.print("[HTTP] GET...\n");
  // start connection and send HTTP header
  int httpCode = http.GET();

  // httpCode will be negative on error
  if (httpCode > 0) {
    // HTTP header has been send and Server response header has been handled
    USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);

    // file found at server
    if (httpCode == HTTP_CODE_OK) {
      String payload = http.getString();
      USE_SERIAL.println(payload);
    }
  } else {
    USE_SERIAL.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
  }

  http.end();
}
2

Well, where is http declared?

In the basic example for the client I see this:

   HTTPClient http;

    Serial.print("[HTTP] begin...\n");
    if (http.begin(client, "http://jigsaw.w3.org/HTTP/connection.html")) {  // HTTP
3

I'm not sure. I copied it from an example that had all of the same lines.

4

Make it global. You've declared it locally in loop and you're trying to use it in OpenWeb.

5

Thanks WildBill, now it compiles.

6

Now it isn't running. Throws an execption. Thing is I don't know if the "Authorization" sketch would crash too. And ESP exception decoder isn't working! I'm gonna go to bed. Does anybody know a SIMPLE authorization HTTP sketch, one that doesn't care if you are connected via wifi or ethernet? Because I think the issue is I have conflicts in wifi commands.

7

While it's solved but it does appear that UDP will throw an exception when ran with HttpClient. I have to code the HTTPclient myself from a TCP client.