nordicplayground / android-nrf-uart

nRF UART app for Android. A simple app showing how to handle BLE with custom service in Android.

Android-nRF-UART

This application is deprecated and no longer supported. For new app development please use nRF Blinky or nRF Toolbox which can be found on https://github.com/NordicSemiconductor/.

nRF UART app can be used to connect to Bluetooth® Smart devices running a custom Nordic Semiconductor UART service. When connected, the app can send and receive ASCII and UTF-8 text strings.

This app works with the ble_app_uart project in the nRF51 SDK and the Bluetooth Smart SDK for Arduino.

This app created as a demonstration for handling 128 bit proprietary UUID service and characteristics.

The current version is 2.0.1

This source code can be compiled with Android Studio and Gradle.

Note

• Android 4.3 or later is required.
• Android Studio supported

android-nrf-uart's Issues

Gradle build error with Android 23 and instant run

The App is using older SDK and gradle for compiling the project which is causing build error with Android Studio using latest Android SDK.

https://github.com/NordicSemiconductor/Android-nRF-UART/blob/master/app/build.gradle

Solution

Update your Project level gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.2'

    }
}

allprojects {
    repositories {
        jcenter()
    }
}

App level gradle

apply plugin: 'com.android.application'
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.nordicsemi.nrfUARTv2"
        minSdkVersion 18
        targetSdkVersion 23
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile 'com.android.support:support-v4:23.0.0'
}

Location Permission is required for Android Marshmallow 6.0 and Higher

https://stackoverflow.com/questions/33045581/location-needs-to-be-enabled-for-bluetooth-low-energy-scanning-on-android-6-0

Send texts longer than 20 chars

At the moment it isn't possible to send more than 20 characters at once. My application requires to send longer Strings, is there some kind of buffer size which can be configured? Do i need to split the text?

Update required

Please update the version of nordic UART to the latest

bluetoothgatt discoverServices takes so long

from this log it shows that from mBluetoothGatt.discoverServices() to public void onServicesDiscovered(BluetoothGatt gatt, int status) callback took about 6 seconds for android 6.0.1 & 5.x. for android 4.4.2 it takes about 10 seconds, for android 4.3 about 1 second.

i like to know is there way to control / improve it ?

12:02:41.642 D/BluetoothGatt: connect() - device: F7:73:DE:00:4D:DE, auto: false
12:02:41.642 D/BluetoothGatt: registerApp()
12:02:41.642 D/BluetoothGatt: registerApp() - UUID=8a45498c-dcdf-4987-970d-0395638f72c6
12:02:41.644 D/UartService: Trying to create a new connection.
12:02:41.644 D/BluetoothGatt: onClientRegistered() - status=0 clientIf=5
12:02:42.775 D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=5 device=F7:73:DE:00:4D:DE
12:02:42.775 D/UartService: onConnectionStateChange state = 2
12:02:42.777 D/UartService: broadcastUpdate 1
12:02:42.777 I/UartService: Connected to GATT server.
12:02:42.796 D/BluetoothGatt: discoverServices() - device: F7:73:DE:00:4D:DE
12:02:42.801 I/UartService: Attempting to start service discovery:true
12:02:48.298 D/BluetoothGatt: onSearchComplete() = Device=F7:73:DE:00:4D:DE Status=0
12:02:48.298 W/UartService: mBluetoothGatt = android.bluetooth.BluetoothGatt@ace296b
12:02:48.299 D/UartService: broadcastUpdate 1
12:02:48.304 D/BLE_com: ACTION_GATT_SERVICES_DISCOVERED

Enable notification on TX characteristics after pairing

I discovered that on nRF-UART Android app, notifications are not enabled by default if ble-app-uart is paired without bonding. This resulted in ble-app-uart not being able to transmit data to nRF-UART as notifications were disabled. This is not a problem if pairing/bonding is disabled.

How can I enable notification on TX characteristics on nRF-UART after pairing with ble-app-uart without bonding?

Thank you.

Add support for android API Level 26+

i cant send cmd to device

E/UartService: mBluetoothGatt nullandroid.bluetooth.BluetoothGatt@2aa156fa
D/UartService: write TXchar - status=false
device is connected but cmd is not sending

Problem with LocalBroadcastManager

I have updated the build tools to the latest version (30) and gradle/dependencies to 2.0.0, but I still can't run the project due to an error in the LocalBroadcastManager include/import in UartService and MainActivity. Does anyone have a solution/tip? It would be greatly appreciated!

Uploading a screenshot of the error and my idea.log if that helps :)
idea.log

Get a Secret Bluetooth Pin from My Segway Device

Hello,
I'm connected via nRF UART v.2.0 to my Segway S PLUS in order to get the PIN code because there is no way of connecting to it via BL without the official app.
I just don't know what command to write in order to do get it or reset it. (screenshot attached)
any ideas?

Unable to sync project , shows gradle build failed.....

Scan Device Failed When Upgrade build.gradle(app)

When updated the compilesdkversion and targetsdkversion to 28 , scan device failed.

apply plugin: 'com.android.application'
android {
compileSdkVersion 28

defaultConfig {
    applicationId "com.nordicsemi.nrfUARTv2"
    minSdkVersion 18
    targetSdkVersion 28
}


buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
}

}

dependencies {
implementation 'com.android.support:support-v4:23.0.0'
implementation 'android.arch.lifecycle:viewmodel:1.1.1'

}

React Native plugin for nRF52 BLE UART

Hi, is there any React Native plugin fit for nRF52 BLE UART app for both Android and iOS?