ESP32 | BLUETOOTH CLASSIC | FLUTTER - Let's build BT Serial based on the examples. (Ft. Chat App)
ฝัง
- เผยแพร่เมื่อ 8 ก.ย. 2024
- This video briefly shows a demonstration before starting a project with Bluetooth Classic. I'll show you two examples: the Bluetooth Serial Library for ESP32 and the Bluetooth Serial for Flutter application. Also, it's including the small chat application under the example of the flutter library. It'll be a tutorial series. Thanks. 🙏
Note: iOS devices connect using Bluetooth Classic, but it must be an MFi certified device in order to connect. Also, the library of Flutter Bluetooth Serial doesn't support iOS build so I don't deal with the iOS build at this time.
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Updated 06-21-2021
Due to Flutter's update, many parts have changed from the tutorial video.
You need to keep @dart=2.9 before starting main to avoid null safety in Flutter 2
I modified the code to work temporarily.
[Bluetooth Serial Library]
github.com/esp...
[flutter_bluetooth_serial]
pub.dev/packag...
[Project Github Link]
github.com/001...
Music:
Music provided by NoCopyRightSounds from TH-cam.
#ESP32 #FLUTTER #BLUETOOTCLASSIC #SERIAL #RFCOMM #SPP
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Literally the only tutorial that I've found that actually works.
Bruce Wayne Thanks 🙏
Great, you started voiceover.
Best of luck.
It's great !
waiting for the next part。
huang steven Thanks.
Nice video! Exactly what I needed. Maybe you can add subtitles for better understanding?
Sorry. For the time being, I'm going to make a project video without subtitles. It's going to be better. Thanks for your understanding.
GOOD VIDEO !! It worked for me.
많은 도움이 됐어요!
thank u bro its great tutorial
thx u ; as always great works
Hi , I have run this code but i am not able to see the list of paired device when you go to chat , please help .. Api level 33 Android
i tried the code which is in the git link u provided..but it is not showing available devices..can u help me please.
Which Android version do you use? Bluetooth Permission settings may vary depending on the Android version.
first comment yessss
mourad oudddah Thanks!
Please upload subtitles:) Otherwise good
haha sorry for that.
Hello Bro, can you help me? I used the flutter_bluetooth_serial package: ^0.4.0 in a specific project. When I ran the application on a real device with Android version 11, it worked and there were no problems, but when I ran the application on Android version 12 and above, the application crashes (it does not open). Is it possible that there is a problem with the permissions, site permissions, etc.?
Have you tried this one? Seems like you've already on this page. github.com/edufolly/flutter_bluetooth_serial/issues/200#issuecomment-1711851838
Hello! hope everything is well with you.
I'm creating a glove that translates gestures into text and audio and I need your help to develop the corresponding application with Flutter, ESP32, Arduino IDE and Bluetooth.”
Just create a flutter application that will receive words coming from the Arduino IDE's serial monitor and print it on the application screen.
I would really appreciate it.
can u pls update this video according to new flutter update
I will use the latest version in my next Flutter project.
thanks for the tutorial, I'm trying to build an application that send and receive data from a device, finally I knew how to send data using this function
void _sendMessage() async {
connection.output.add(utf8.encode("data here" + "
"));
await connection.output.allSent;
}
but I did not know how to receive data from device to the smartphone
can you please guide on how to receive the data ?
thanks
Have you checked this source code?
github.com/0015/IdeasNProjects/blob/master/ESP32_BT_CLASSIC/ESP32_BLUETOOTH_SERIAL_DEMO/android_bluetooth_serial_app/lib/ChatPage.dart
From the function, _onDataReceived(Uint8List data) all transmitted data is coming through if there is buffer data that is sent from a device.
@@ThatProject yeah I checked the code this function is void so it hasn't any returned value, if I want to print the received data how can I do it ? thanks for your time
@@aminemaiza1935 The registered function (_onDataReceived) is called via listen because the data enters streaming. You can print string data by using the dataString in the console.
@@ThatProject I'm sorry to bother you , but I don't understand, but If I want to read data received from bluetooth and print it in the console for example, what to use inside the print function print(), thanks for your time
@@aminemaiza1935 try this print(dataString) in _onDataReceived(Uint8List data))
Great job.
Is it possible to make ESP32 accept multiple smartphone connections/interactions (everyone at home) with a Flutter app?
ESP32 needs to allow multiple connections. I'll make another project if I have a good chance. Thanks.
@@ThatProject Ok. I thought this idea would be possible, it doesn't make sense that only one person in the house can have control of the lights controlled by ESP32.
Maybe some way to release the bluetooth connection when you close the application, so that the connection is free for the next user.
I don't know much about electronics and programming, I'm just trying.
Thanks for answering.
@@flaviohenrique38 Sure. I think there is a way to make it as you thought. One thing we need to make sure is that controlling house light is using HomeKit, not BT. What I mean is you can build your own chat app with ESP32 via BT and also controlling IoT devices at your house is by using HomeKit. It's operating totally different. I'd like to get a chance to touch this HomeKit sooner or later on my channel.
@@ThatProject HM, OK. I do not use any IoT automation solution available on the market.
The idea is to create your own IoT, using 5v relays available on the market and some way to control via the Flutter application, available so that all authorized smartphones (paired?) Can send commands without competition on the BT connection.
It would be very interesting if it could be done, I don't have enough knowledge to know that.
Thanks.
@@flaviohenrique38 what about BLE? There's no connection between the devices, so talking to it via multiple phones should work.. maybe
hello, i am working on a project to plot realtime ECG sensor's plot in the app(sensor is connected with esp32) .. i am currently using firebase for this but the delays are too much and its totally internet dependent. i wanna make this work on bluetooh.. can u help me ? any help would be appreciated
thanks in advance
What is the end device? PC or mobile? If the data set from ECG is big, you may need to get data via WiFi.
Nice bro. Can you try ble using esp32 for navigation oled screen if possible .. Your video are class apart
Bee Kay Thanks for watching. As you know, I have already carried out many projects with BLE on my channel. If I have a chance, I will proceed with the project. Thanks.
@@ThatProject thank you bro... 😇
Does it work for two devices to connect and use as a chat app over Bluetooth??
Yes, but in this case it must support Bluetooth Serial.
How do you initially pair the devices? Your video seemed like they were already paired.
Check this out again. You'll see how I connect it from Flutter App.
th-cam.com/video/WUw-_X66dLE/w-d-xo.html
Hello , I'm working on a project which I need to send photo that I selected on the gallery images of the smartphone and I want to send it to the ESP-32 , it is possible with Bluetooth serial ?
In one of my BT Serial projects, it's sending the QR code image from the Flutter app to ESP32. I hope it'd be helpful for your project. th-cam.com/video/7HLh-7vONT4/w-d-xo.html
Hi and thank you for this video!
I need to make an app with multiple page where i can set some delay and turn on some led from Android/iOS to ESP32.
Can i use this? Instead of sending text from chat i'll send the value form textbox or slider to arduino or using a button to send a "LED1 ON" text.
Is there another/better wayto do this?
Thanks in advance
This app is for Android only. Data cannot be transferred via Bluetooth Serial on iOS. Bluetooth LE is the possible communication in iOS too. Please refer to other BLE-related projects on my channel.
Do you have a phone connected to Flutter? Without android connected, the VSCode halts on this line inside the FlutterBluetoothSerial class (FlutterBuetoothSerial.dart) :
/// State of the Bluetooth adapter.
Future get state async => BluetoothState.fromUnderlyingValue( await _methodChannel.invokeMethod('getState'));
For development, is possible to simulate the ESP32 by using a usb bluetooth dongle (2.1 EDR, 4.1, etc) to send data to the android phone, while debugging the app in Flutter?
I've tried a few USB BT devices, but can't seem to get android to pair/connect! Does the dongle/stack need to support SPP-over-BLE.. or something like the Cordova (PhoneGap) Plugin?
Hi. As I mentioned, the android emulator does NOT support Bluetooth. So you must prepare a REAL device to run your code.
Nice job! But how can we solve that problem? "The plugin `flutter_bluetooth_serial` uses a deprecated version of the Android embedding."
Hey Burak! It seems necessary to modify based on the new version 0.4.0 of the flutter_bluetooth_serial. I updated the code to work 3 months ago, but it looks like it needs to be updated again. Have you tried it with the new version?
Does it work with Arduino and bluetooth module hc05 or only esp32
?
This is the project for only ESP32.
Thank you for your tutorial, that really helps to the project I'm working on. However, I'm working with The Adafruit Feather nRF52 Bluefruit device, it's a BLE Bluetooth device, I'm wondering if this ESP32 code works as same as my device. my issues right now are I can't make the connection with my device and sending or receiving a message. If you know how to make a connection between nRF52 and Flutter UI, can you please let me know? Thank you so much!
Hi. Unfortunately, Adafruit nRF52 is a Bluetooth Low Energy board, not Bluetooth Classic. Please watch my BLE video series. It's gonna be helpful for you. th-cam.com/video/w6jo2kJanqU/w-d-xo.html
@@ThatProject Thank you.
I have a problem with serial communication in chat page when i connect to paired device to chat. It's fail to send chat from serial monitor to my device but success to send chat from device to serial monitor and then when i click conncet to paired device to chat in my device wasn't asking the permission of my device location, is that the problem of it?
Permission is required to use BT on Android devices. What is the version of your Android device? If the version is low, you can register directly on the Android manifest file.
@@ThatProject Good, it's work sir, thank you very much!
Can you please tell me how to enable communication between two mobiles instead of arduino board and mobile?
On one side, it should be a Bluetooth server. If I have a good project idea, I will proceed with it. Thank you for your understanding.
Hello, im new on this. Arduino doesnt recognized the #include "BluetoothSerial.h". How can i solve this?
Hi, Did you install the Arduino core for the ESP32?? Please take a look at this, github.com/espressif/arduino-esp32
flutter bluetooth serial main page is missing in git
Are you looking for this? github.com/0015/ThatProject/blob/master/ESP32_BT_CLASSIC/ESP32_BLUETOOTH_SERIAL_DEMO/android_bluetooth_serial_app/lib/MainPage.dart
Scan is not working
@@ashickyogithan416 Maybe permission issue? try to add them in the AndroidManifest.xml
How can we build same app for IOS.? it is not supporting IOS
No. There is no way to use the BT Classic on iOS.
Is the esp32 emulated? Is that what the code at the start is doing?
The ESP32 has not emulated anything.
my chat page is generating an error in "widget.server.name" saying string type cant be used directly pls help me to resolve it
widget.server.name is just string data from BluetoothDevice class and it's just showing the name of the device. If it has an issue, you can delete it.
@@ThatProject i am getting another error for "await FlutterBluetoothSerial.instance.isEnabled" saying A "nullable expression can't be used as a condition.
Try checking that the value isn't 'null' before using it as a condition." . please help me to resolve it
@@konerugeethareddy6438 just put ! like this
await FlutterBluetoothSerial.instance.isEnabled!
This project was created before the Flutter null-safety concept came along. Some modifications are required to work with the latest version of Flutter. Please take a look here.
dart.dev/null-safety/understanding-null-safety
@@konerugeethareddy6438 hey hi..wondering if it worked for you
is this using BLE or using standard Bluetooth connection?
Not BLE but BT Classic.
@@ThatProject is it possible to use ble for this app? do you have references?
Is it possible to apply this between two android devices ?
There are many better solutions for two Android devices instead of this way. I recommend that you find another way.
@@ThatProject thanks for ur quick response , I'm trying to develop a flutter application with feature chat offline without internet ,would you please recommend which way is the best and applicable ?
@@hajerwael7690 I see. Based on the code in this video, please try to implement the Bluetooth server-side and client-side of Flutter. Good Luck.
@@ThatProject thanks alot , I found an alternative called nearby connection,applied it and worked like charming ...
is tis wok on iPhone ???
Of course not. This works for Android only.
hello brother can you help . In my app the bluthoot names is not showing
Sorry I don't remember anything for this project. I think you need to check whether the information for the connected device is correct or not.
When I compile the project i get many error: "... can't have a value of 'null' because of its type ...".
How I can resolve the problem?
Have you changed anything in my code?
@@ThatProject no, I think the problem is the last version of dart and flutter, but I can't resolve it
@@FabioContardi Oh, oh, you're right. There is a problem that the old code does not work as it is updated to Flutter 2. I modified the code to work temporarily. Please check the code again. github.com/0015/ThatProject/tree/master/ESP32_BT_CLASSIC/ESP32_BLUETOOTH_SERIAL_DEMO/android_bluetooth_serial_app
@@ThatProject Tomorrow I try it, ty for the support