I want to use Bluetooth BLE to receive data from heart rate and send a command to second device. I write two program acccording to android sample(http://developer.android.com/samples/BluetoothLeGatt/index.html).
first program is to use the android to receive heart from A device by bluetooth.
second program is to use the android to send command to B device by bluetooth.
I merge two Bluetooth service into one program. but it seems not work.
i created, one BluetoohManager, one BluetoothAdapter, two service classes,two BroadcastReceiver, two BluetoohDevices. I don't if it is the right way. it seems not work. Does anyone have some code example? or does someone can tell me how to modify the android code example (BluetoothLeGatt) to deal two bluetooth devices?
We have some of the best libraries available for bluetooth communication, this might help you
Bluetooth LE Library for Android
SmartGattLib
android-btxfr
Android-BluetoothSPPLibrary
Android-Bluetooth-Library
Related
I'm developing Flutter app for Android, where I want to exchange some data between few instances of my app on different devices via Bluetooth. I'm using flutter_bluetooth_serial package (this is the only package I found which supports Bluetooth Classic, not Bluetooth Low Energy). I'm able to make connection
between device 1 and device 2 using BluetoothConnection.toAddress(device.address); (but even there was a problem, I had to modify the plugin and apply this workaround to make connection work).
Now I want to run my app on device 2 (which is connected with device 1) and send or receive some data, but I have no idea how I can do that using flutter_bluetooth_serial. In device 1 where I create connection I can use result of BluetoothConnection.toAddress(device.address) to send or listen for some data, but on device 2 I can't use it, because connection is already established by device 1 and I can't see another API for communication.
To simplify: let's say I want to achieve something more or less like Bluetooth chat functionality in this example application, but between multiple Flutter applications, not Flutter app and raspberry pi.
Is there any way of solving it with use of flutter_bluetooth_serial or any other package? Or I have to write some native Android code?
I need to transfer data from android phone to each other through my application using BLE. When a device comes near to me and my application is already installed in it, So my phone will establish a connection and send some data in strings and also receive from that device without notify user. Is it possible to do with BLE and I have studied BLE from
https://developer.android.com/guide/topics/connectivity/bluetooth-le
But I am new so I dont know from where to start and what should i have to do? Kindly let me know about BLE more easy for my better understanding and refer me some tutorials where I can learn that how will fulfill my application functionalities.
Thanks
I suggest starting with the Central-Peripheral example. Here you have an simple application:
https://github.com/itanbp/android-ble-peripheral-central
And tutorial with basis:
https://www.bignerdranch.com/blog/bluetooth-low-energy-on-android-part-1/
In the case you described, if there are not defined roles for the android phones (master, slave), the program will have to work in alternately in two modes: central and peripheral.
This is possible form the BLE side. However, there may be a problem with the application wroking as a background service. Since Android 8 there are new restrictions and limitations in background sericves:
https://developer.android.com/about/versions/oreo/background
Bluetooth Low Energy on Adnroid is very troublesome technology. A lot depends on the version of Android, processor and antenna system of the phone.
is it possible to send data (e.g. a textfile) directly from one android wearable to another wearable - for example via bluetooth? Or is it required to communicate over the two associated handhelds?
Many thanks!
Henriette
Yes, it is possible since Android Wear fully support the Bluetooth library. You may not use the Android Wear Library that for NOW only connect ONE Wearable to ONE Smartphone.
You need to implement a wearable application managing bluetooth discovery and pairing, then by opening a connection socket you can exchange the data you want.
From the second part of your question, it seems you are referring to two wearable devices that are paired with two separate phones. In that case, there is no connectivity or association between these two devices and you can only achieve communication between them by, say, using the phones and handling the communication over there; that may happen in a variety of ways depending on your requirements
i am working on an android app in which I need to only listen for incoming devices an log the data they are sending using Bluetooth, device sending data is basically a digital Bluetooth enabled thermometer which just sends the data. Problem is i don't know where to start as i m new to android programming. Just a step by step Procedure would be enough to guide me on the right track . i tried Bluetooth chat example but i didn't took me any where also i wasn't able to understand it.
Regards,
Rafiq Ahmed
First thing you need is to know how to make the connection with the thermometer. I suppose that, since the device is paired to the smartphone, you only must to manage the connection as a server (On the android-phone). Here you got a summarize:
Change Bluetooth permissions:
http://developer.android.com/guide/topics/connectivity/bluetooth.html#Permissions
Enable and set up the bluetooth: http://developer.android.com/guide/topics/connectivity/bluetooth.html#SettingUp
Find the device: http://developer.android.com/guide/topics/connectivity/bluetooth.html#FindingDevices
Connect with it: http://developer.android.com/guide/topics/connectivity/bluetooth.html#ConnectingAsAServer
And manage the connection:
http://developer.android.com/guide/topics/connectivity/bluetooth.html#ManagingAConnection
And last thing, I recommend you to pair the device before running the application, at the adjust menu of your mobilephone. Since that, follow the previous steps and all will be fine. If you have some doubt ask me, I had the same troubles about bluetooth connections with arduino and HC-06 bluetooth device
Hope it helps
I'm asking because I've been facing that issue for weeks.
I need to develop an Android application that can be able to perform an Bluetooth Connection and send data to an Bluetooth Hardware.
Ok, so here's the point:
is it possible to perform a RFCOMM connection to an 'unknown' device?
I mean, is it possible to do this without having any information about the hardware code?
Because i'm only able to modify the AndroidDevice (cellphone) code, for SENDING purposes.
I want to send a byte and make sure it was received, but there's only a sending code.
Could we have some more details? Is the other device accessible by you, as in can the other device know information about the Android device? And what do you mean by a "sending code"?
The Android device can pick up any active Bluetooth device in its range, and know the name and address of those devices. So, if the Android device doesn't know anything about the Bluetooth device it wants to connect to, you can always sort through the list of devices in range, and get its hardware code through that.
See the documentation about Bluetooth, specifically the Finding Devices section:
http://developer.android.com/guide/topics/connectivity/bluetooth.html
I've done a fair amount of Bluetooth work with Android devices and Arduinos, and the Bluetooth library might be a bit of a pain to work with, but it is powerful.
With bluetooth the two devices have a UUID. If you a writing a program that runs on both devices you have them listen for that UUID. When they connect as a client or a server you have a dataInputStream and a dataOutputStream. Then you can push and pull bytes out of those.