ESP8266 Community Forum

- Sat Dec 29, 2018 11:13 am #79763 Hi guys, new to the forum and relatively new to Arduino coding.. Hoping someone can point me in the right direction.

I am using a D1 mini (clone) in STA mode, connected to my home wifi. I have successfully got an Android APP connected through the wifi network to the D1 and can send HEX commands based on button presses.

I have previously used Blynk but when I found this App https://play.google.com/store/apps/details?id=udpcontroller.nomal&hl=en I thought I'd give it a go.

All works well and I am able to 'get' the incoming data byte by byte in the main 'Loop' adding them together to give the unique 'button command' then calling a new function when all bytes are received (buffer empty).

Code: Select allvoid loop() {
  WiFiClient client = server.available();

  while (client.connected()) {
    while (client.available()) {
      byte thischar = client.read();
      allchars = ++ thischar;
      Serial.print(thischar, HEX);
    }
    if (allchars != 0) {
      newcommand();
    }
    allchars = 0;
  }
}


and then use a case statement in the new command function to carry out actions depending on the button pressed.

Code: Select allvoid newcommand() {
  Serial.println("-----");
  Serial.print(allchars);
  Serial.println("-----");
  switch (allchars) {
    case 19 : newloop(); break;
    case 20 :      break;
    case 21 :      break;
  }
}


My question is this..

When I call the newloop() function I want that function to run until new data is received,

I tried

Code: Select allvoid newloop() {

  while (1) {
     if (client.available()) return;
  }
}

But this gives client undeclared, which makes sense as it is previously declared inside the main loop and not globally.
However I have tried numerous combinations, adding declarations in various places, including in newloop(), I have also tried declaring a new client1 and disconnecting and reconnecting the TCP (Application), but no matter what I try I can't seem to come up with a way to 'break out' of the loop when I try to send a new command from the Android app.

For context I am trying to control an RGB strip and can use the App to change colour, turn them on and off etc. But the idea was to call a function which would run a fade or flashing/transition pattern until the next command is received fro the App.

Please note the code above is just sample code I put together by way of an explanation and not from the actual RGB.

Thanks in advance and apologies if I have posted in the wrong place or if the links/code snippets are not formatted as expected.

- Fri Jan 04, 2019 5:52 am #79860 I suggest either declaring client as a global (i.e. outside of loop) or passing it as an argument into newloop.