Getting Nextion HTTP OTA uploads working

Blynk_Coeur · February 13, 2021, 10:23am

I created my own functions for Nextion, so I just need to call them and pass arguments

///////////////////////////////////// WriteStr /////////////////////////////////////
void WriteStr(String command, String txt) {
  String _component = command;
  String _strVal = txt;
  if (_strVal == "cmd") {
    Serial.print(_component); // for editor serial port simulation mode
    Serial.print("\xFF\xFF\xFF");

    Nextion.print(_component); // for Nextion serial port
    Nextion.print("\xFF\xFF\xFF");

  } else if (_strVal != "cmd") {
    Serial.print(_component);
    Serial.print("=\"");
    Serial.print(_strVal);
    Serial.print("\"");
    Serial.print("\xFF\xFF\xFF");

    Nextion.print(_component);
    Nextion.print("=\"");
    Nextion.print(_strVal);
    Nextion.print("\"");
    Nextion.print("\xFF\xFF\xFF");
  }
}

///////////////////////////////////// WriteNum /////////////////////////////////////
void WriteNum(String command, int val) {
  String _component = command;
  int _numVal = val;
  Serial.print(_component);
  Serial.print("=");
  Serial.print(_numVal);
  Serial.print("\xFF\xFF\xFF");

  Nextion.print(_component);
  Nextion.print("=");
  Nextion.print(_numVal);
  Nextion.print("\xFF\xFF\xFF");
}
///////////////////////////////////// WriteVis /////////////////////////////////////
void WriteVis(String command, int val) {
  String _component = "vis " + command;
  int _numVal = val;
  Serial.print(_component);
  Serial.print(",");
  Serial.print(_numVal);
  Serial.print("\xFF\xFF\xFF");

  Nextion.print(_component);
  Nextion.print(",");
  Nextion.print(_numVal);
  Nextion.print("\xFF\xFF\xFF");
}

///////////////////////////////////// readStr /////////////////////////////////////
void readStr(String TextComponent) {
  String _Textcomp = TextComponent;
  Serial.print("get ");
  Serial.print(_Textcomp);             // The String of a component you want to read on Nextion
  Serial.print("\xFF\xFF\xFF");
  NexListen();
  DataReceived();
}

void setup() {
Nextion.begin(NxBaud);
Serial.begin(SrlBaud);

For example :

  ///////////////////////////////////// temp interieure /////////////////////////////////////
  String T_Int = String(temperature).substring(0, 2);
  WriteStr( "home.T_Int.txt", T_Int);

daveblynk · February 15, 2021, 5:46pm

Oh boy! All those sketches that worked yesterday don’t work now All say can’t get baud rate… the baud rate on the display says 250000 and the sketch is 250000

Blynk_Coeur · February 15, 2021, 6:16pm

That can help :

daveblynk · February 16, 2021, 11:42am

Ok I’ll see if I can implement this. Would a serial.read just before help to empty the buffer?

Blynk_Coeur · February 16, 2021, 12:26pm

Yes the serial read clean the buffer .

daveblynk · February 17, 2021, 5:13pm

So today it is working again but only at 115200 baud rate.

daveblynk · February 22, 2021, 10:18am

Hey Alexis, just a question. What do these two two functions look like or do?

Blynk_Coeur · February 22, 2021, 4:08pm

It’s my script to read and decode the data received from Nextion

void NexListen() {
  delay(30);
  WriteVis( "47", 1); //ACK nextion widget
  if (Serial.available()) {
    Blynk.virtualWrite(V16, 255); // data led
    terminal.println("NexListen : " + Time);
    terminal.flush();

    while (Serial.available()) {
      incomingByte = Serial.read();
      data_from_nextion += char(incomingByte);
      x++;
      Blynk.run();
    }

    if (data_from_nextion.endsWith(endChar)) {
      x = 0;
      Blynk.virtualWrite(V16, 0); // data led
    }
  }
 WriteVis( "47", 0);//ACK nextion widget
}

void DataReceived() {
  terminal.print("Data Received : ");
  terminal.println(id);
  terminal.print("Return Data Value : ");
   int eos = data_from_nextion.indexOf(endChar);

  if (data_from_nextion.substring(0, 1) == "q") { //number
      for (int x = 0; x < 4; x++) {
      getDataUnion.getDataByteArray[x] = data_from_nextion[x + 1];
    }
    Return_Value = getDataUnion.getDataLong;
    terminal.println(Return_Value);
    terminal.flush();
    getDataUnion.getDataLong = 0;
    data_from_nextion = "";

    switch (id) {
      case 1:
        if (Return_Value > 150 && Return_Value < 260) {
          threshold1 = Return_Value / 10;
          Blynk.virtualWrite(V23, threshold1);
          Blynk.virtualWrite(V26, threshold1);

        }
        break;

      case 2:
        if (Return_Value > 100 && Return_Value < 165) {
          threshold2 = Return_Value / 10;
          Blynk.virtualWrite(V27, threshold2);
          Blynk.virtualWrite(V29, threshold2);
        }
        break;

      case 3:
        timer1 = Return_Value;
        break;

      case 4:
        timer2 = Return_Value;
        break;

      case 5:
        if (Return_Value == 1) {
          Blynk.virtualWrite(V34, HIGH);
          setOn = true;
        } else if (Return_Value == 0) {
          Blynk.virtualWrite(V34, LOW);
          setOn = false;
        }
        break;

      case 6:
        HI = Return_Value;
        break;

      case 7:
        Blynk.virtualWrite(V101, Return_Value);
        break;

      case 8:
        Blynk.virtualWrite(V103, Return_Value);
        break;

      case 9:
        Blynk.virtualWrite(V105, Return_Value);
        break;

      case 10:
        Blynk.virtualWrite(V107, Return_Value);
        break;

      case 11:
        startAt = (int)Return_Value * 60;
        break;

      case 12:
        stopAt = (int)Return_Value * 60;
        Blynk.virtualWrite(V100, startAt, stopAt, "Europe/Paris");
        break;

      case 13:
        startAt = (int)Return_Value * 60;
        break;

      case 14:
        stopAt = (int)Return_Value * 60;
        Blynk.virtualWrite(V102, startAt, stopAt, "Europe/Paris");
        break;

      case 15:
        startAt = (int)Return_Value * 60;
        break;

      case 16:
        stopAt = (int)Return_Value * 60;
        Blynk.virtualWrite(V104, startAt, stopAt, "Europe/Paris");
        break;

      case 17:
        startAt = (int)Return_Value * 60;
        break;

      case 18:
        stopAt = (int)Return_Value * 60;
        Blynk.virtualWrite(V106, startAt, stopAt, "Europe/Paris");
        break;
    }
  } else { // text received from Nextion
    String Return_Value = data_from_nextion.substring(1, eos);
    data_from_nextion = "";
    if (Return_Value == "auto") {
      Blynk.virtualWrite(V34, HIGH);
      setOn = true;
    } else if (Return_Value == "manuel") {
      Blynk.virtualWrite(V34, LOW);
      setOn = false;
    }
  }
}

nodoubtman · March 24, 2021, 6:38pm

ha ha ! :-p

Blynk_Coeur · March 25, 2021, 5:18pm

3 years later

daveblynk · March 29, 2021, 7:35pm

@Blynk_Coeur Hey been awhile since we brought this one up… I’m having an issue one of my variables for humidity set point keeps jumping to a random number after I input the number I want. I think it has something to do with having too many WriteStr or WriteNum calls because if I remove one it seems to work ok. Does that make sense? With the timers, buttons and pictures, plus indoor and outdoor humidity and temperature it looks like about 20 different calls to the functions you made. Just looking at yours it would seem like you are doing more do you have any idea what could be wrong? If you want I could post my code herd

Blynk_Coeur · March 30, 2021, 8:39am

@daveblynk

I think your are right ,
I use timers and my void loop only contains blynk.run , ota , etc …, nothing about nextion

 ///////////////////////////////////// timers /////////////////////////////////////
  timer.setInterval(1000L, GetTime);// clock 
  timer.setInterval(10010L, TempUpdate);// read DHT11
  timer.setInterval(20020L, Gauge); // read fuel level
  timer.setInterval(21040L, Acquisition1);// read nextion1
  timer.setInterval(30050L, Acquisition2);// read nextion2
  timer.setInterval(40060L, Hvac);// Hvac control
  timer.setInterval(60070L, forecast);// call openweathermap.org
  timer.setInterval(70080L, connectionstatus);// check wifi


void loop() {
  if (Blynk.connected()) {  // If connected run as normal
    Blynk.run();
  } else if (ReCnctFlag == 0) {  // If NOT connected and not already trying to reconnect, set timer to try to reconnect in 60 seconds
    ReCnctFlag = 1;  // Set reconnection Flag
    timer.setTimeout(60000L, []() {  // Lambda Reconnection Timer Function
      ReCnctFlag = 0;  // Reset reconnection Flag
      Blynk.connect();  // Try to reconnect to the server
    });  // END Timer Function
  }
  timer.run();
  ArduinoOTA.handle();  // For OTA
}

daveblynk · April 4, 2021, 6:03pm

Ok so I think I found my problem. I was using a char strTime[16];

sprintf(strTime,"time.txt=\"%u:%02u PM\"\xFF\xFF\xFF",hourFormat,minute());

Which is easy to create an array, however I think this was some how messing with my stored int variable for humidity set point. I think it has something to do with pointers but I can’t wrap my head around it.

I changed this to :

StrTime = StrTime + ":" + strMinute;

and now my setPoint variable doesn’t change.

EDIT **I think maybe the problem was the size of the char I didn’t count the FFs in the size. I am trying [35] and the sprintf statement seems to be working. **

PeteKnight · April 5, 2021, 8:33am

Hi @daveblynk I was trying to use a Python HTTP server (for something different) and followed your instructions in post #18
Step 4 confused me, as I thought I was supposed to be typing the IP address and port into the CMD window. I wasn’t until I googled how to do this that I realised that this was in a browser window (makes sense of course - in hindsight ).

So, I used my moderator’s superpowers to edit your post and add the bit in bold below - just so that it’s easier for others to follow in future…

Hope that’s okay with you. How is this Nextion OTA stuff working for you now?

Pete.

daveblynk · April 5, 2021, 9:01am

No problem!

I have been just OTAing the basic NextionOTA sketch when I do some changes to the GUI. Then after that, OTAing the Blynk sketch back onto the device. Saves taking the box apart but still isn’t ideal. I have no idea why it work earlier to us a virtual pin to trigger the NextionOTA but now it refuses.

daveblynk · June 9, 2021, 7:46pm

@Blynk_Coeur you got your two “cylinder” esp32 yet? When I get settled back into a home again I want to order some dev boards (home drawn PCBs) for my D1 mini 32s and get serious about some projects. Still tuning your thermostat? You’ll have to try Nextion OTA with the new blynk library and let me know if it still conflicts.

Blynk_Coeur · June 9, 2021, 7:53pm

I have 4 ESP32, one for thermostat, one for boiler control ,one for 433Mhz and one for ext temp and fuel level

I didn’t try Nexion OTA with new library.

I am stuck with basic code as date , time , DST
I am using NTP Client, but it’s not so easy as time widget.

and I don’t know how to bridge my 4 MCU

PeteKnight · June 9, 2021, 7:58pm

Have you looked at the NTP library from “the guy with the Swiss accent”…

I’ve not used it, but some people have said it’s very easy.

Pete.

daveblynk · June 9, 2021, 8:00pm

Do you not just subscribe to different data streams on the different devices?

Blynk_Coeur · June 9, 2021, 8:01pm

Good idea, I will try Andreas Spiess 's library 2021-06-09_220136