Bluetooth Low Energy (BLE) library

merlin2049er · Nov 24, 2014

Ok, I'll upload my code tonight.

merlin2049er · Nov 24, 2014

Ok, here the sources for the two ble apps. One app uses a timer and reads the characteristics, the other turns on the notification characteristic and monitors the characteristics change event.

https://www.dropbox.com/s/5t0en4d2e5n7vnx/ble2_source.zip?dl=0

https://www.dropbox.com/s/po9q9g04rq72294/ble_source.zip?dl=0

Erel · Nov 25, 2014

I don't see anything obvious. However this code is wrong:

B4X:

Label1.Text = manager.ReadCharacteristic(c)

You need to wait to the CharacteristicRead event. Only at that point the data will be available.

merlin2049er · Nov 25, 2014

Ok, thanks. I'll try that.

merlin2049er · Nov 25, 2014

So, basically put the code here.

B4X:

Sub BLE_CharacteristicRead (Success As Boolean, Characteristic As BleCharacteristic)
Log("CR: " & Success & ": " & Characteristic.Uuid)
If Success Then 
label1.text = Characteristic.GetStringValue(0)
Log("cr: " & Characteristic.GetStringValue(0))
End Sub
Sub ble_Disconnected
Log("Disconnected")
End Sub

Erel · Nov 25, 2014

merlin2049er · Nov 25, 2014

Thanks.

merlin2049er · Nov 25, 2014

hmm, still. The characteristics property type are of type [notify]. I can't read them (that's why it's returning false).

Erel · Nov 26, 2014

I think that the BleExtended library supports notifications.

sdujolo · Nov 26, 2014

I hade same problem first time I had notify working later it stop working no change in code. I made a button and call "manager.SetCharacteristicNotification(c1, True) 'Define a Notification to get data via Changed event" if I press button it start to notify but not if a call it in "ble_Connected"

merlin2049er · Dec 4, 2014

Erel said:
Android 4.3 adds support for Bluetooth Low Energy. This library allows you to access the new API. It allows you to search for BLE devices, connect to a device and read its services and characteristics.

Writing is currently not supported though it should be simple to add this feature.

From my testings BLE is not yet ready for production
It is unreliable. I also tested it with Google example app and the results were the same.

Seems like others have encountered such issues as well:
http://code.google.com/p/android/issues/detail?id=58381
http://stackoverflow.com/questions/17870189/android-4-3-bluetooth-low-energy-unstable

In order to use this library you will need to download platform level 18 from Android SDK and configure the IDE (Tools - Configure Paths) to use it.

Simple code that starts searching when you click on the activity:

B4X:

Sub Process_Globals Dim manager As BleManager Private cs As List End Sub Sub Globals 'These global variables will be redeclared each time the activity is created. 'These variables can only be accessed from this module. End Sub Sub Activity_Create(FirstTime As Boolean) If FirstTime Then manager.Initialize("ble") Log("Supported: " & manager.BleSupported) End If End Sub Sub Activity_Click Log("Searching for devices") manager.Scan(10000, Null) End Sub Sub ble_DeviceFound (Name As String, MacAddress As String) Log(Name & ", " & MacAddress) manager.Connect(MacAddress, True) End Sub Sub BLE_Connected (Services As Map) cs.Initialize Dim s As BleService = Services.GetValueAt(0) 'Read the manufacturer characteristic Dim c As BleCharacteristic = s.GetCharacteristics.Get("00002a00-0000-1000-8000-00805f9b34fb") manager.ReadCharacteristic(c) End Sub Sub BLE_CharacteristicRead (Success As Boolean, Characteristic As BleCharacteristic) Log("CR: " & Success & ": " & Characteristic.Uuid) If Success Then Log("cr: " & Characteristic.GetStringValue(0)) End Sub Sub ble_Disconnected Log("Disconnected") End Sub Sub ble_DiscoveryFinished Log("DiscoveryFinished") End Sub

Hmm, I ran a little test using two free ble scanning apps. One for the Android, the other for IOS. I enable notifications and checked the characteristics on both. I was able to get more characteristics updated from the Iphone, than with my app and the free ble scanner I used.

bioident · Jan 18, 2015

Hi,

I can't get characteristic from BLE device from original Erel code.

I get only this:

Searching for devices
null, D6:FC:13:0F:37:8D
Discovering services.

Please help what is wrong.

Telephone: Samsung S4 and Android 4.4.2

This is FULL LOG:

LogCat connected to: B4A-Bridge: samsung SM-G900F
--------- beginning of /dev/log/main
in addTimaSignatureService
Cannot add TimaSignature Service, License check Failed
Added TimaKesytore provider
GFXPNG PNG bitmap created width:72 height:72 bitmap id is 180
GFXPNG PNG bitmap created width:72 height:72 bitmap id is 181
GFXPNG PNG bitmap created width:13 height:41 bitmap id is 182
GFXPNG PNG bitmap created width:18 height:18 bitmap id is 183
GFXPNG PNG bitmap created width:18 height:18 bitmap id is 184
GFXPNG PNG bitmap created width:18 height:18 bitmap id is 185
Parent view is not a TextView
GFXPNG PNG bitmap created width:72 height:72 bitmap id is 186
GFXPNG PNG bitmap created width:72 height:72 bitmap id is 187
GFXPNG PNG bitmap created width:72 height:72 bitmap id is 188
GFXPNG PNG bitmap created width:128 height:128 bitmap id is 189
<qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: ()
OpenGL ES Shader Compiler Version: E031.24.00.08+13
Build Date: 03/20/14 Thu
Local Branch: 0320_AU200_patches
Remote Branch:
Local Patches:
Reconstruct Branch:
Enabling debug mode 0
** Activity (main) Create, isFirst = true **
GFXPNG PNG bitmap created width:78 height:96 bitmap id is 190
GFXPNG PNG bitmap created width:78 height:96 bitmap id is 191
GFXPNG PNG bitmap created width:78 height:96 bitmap id is 192
GFXPNG PNG bitmap created width:78 height:96 bitmap id is 193
GFXPNG PNG bitmap created width:78 height:96 bitmap id is 194
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 195
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 196
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 197
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 198
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 199
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 200
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 201
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 202
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 203
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 204
** Activity (main) Resume **
GFXPNG PNG bitmap created width:96 height:96 bitmap id is 205
** Service (service1) Create **
** Service (service1) Start **
Connected to B4A-Bridge (Wifi)
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
Installing file.
** Activity (main) Pause, UserClosed = false **
PackageAdded: package:ble.RG
sending message to waiting queue (CallSubDelayed - UpdateStatus)
** Activity (main) Create, isFirst = true **
Supported: true
** Activity (main) Resume **
Connected to B4A-Bridge (Wifi)
sending message to waiting queue (CallSubDelayed - UpdateStatus)
Searching for devices
null, D6:FC:13:0F:37:8D
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
Searching for devices
null, D6:FC:13:0F:37:8D
sending message to waiting queue (CallSubDelayed - UpdateStatus)
Searching for devices
null, D6:FC:13:0F:37:8D
Searching for devices
null, D6:FC:13:0F:37:8D
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
Searching for devices
null, D6:FC:13:0F:37:8D
** Activity (main) Pause, UserClosed = true **
running waiting messages (3)
** Activity (main) Resume **
** Service (service1) Destroy **
** Service (service1) Create **
** Service (service1) Start **
Connected to B4A-Bridge (Wifi)
Installing file.
** Activity (main) Pause, UserClosed = false **
PackageAdded: package:ble.RG
** Activity (main) Create, isFirst = true **
Supported: true
** Activity (main) Resume **
Searching for devices
null, CC:9F:4F:E4:2F:45
null, CC:9F:4F:E4:2F:45
DiscoveryFinished
null, DE:0A:8B:E2:9B:4B
null, D6:FC:13:0F:37:8D
null, CC:9F:4F:E4:2F:45
null, CC:9F:4F:E4:2F:45
null, D6:FC:13:0F:37:8D
** Activity (main) Pause, UserClosed = false **
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
sending message to waiting queue (ble_devicefound)
running waiting messages (13)
null, D6:FC:13:0F:37:8D
null, CC:9F:4F:E4:2F:45
null, D6:FC:13:0F:37:8D
null, CC:9F:4F:E4:2F:45
null, CC:9F:4F:E4:2F:45
null, D6:FC:13:0F:37:8D
null, D6:FC:13:0F:37:8D
null, DE:0A:8B:E2:9B:4B
null, D6:FC:13:0F:37:8D
null, CC:9F:4F:E4:2F:45
null, D6:FC:13:0F:37:8D
null, D6:FC:13:0F:37:8D
null, CC:9F:4F:E4:2F:45
** Activity (main) Resume **
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
Installing file.
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
PackageAdded: package:ble.RG
** Activity (main) Create, isFirst = true **
Supported: true
** Activity (main) Resume **
Searching for devices
null, D6:FC:13:0F:37:8D
Discovering services.
Searching for devices
null, D6:FC:13:0F:37:8D
Discovering services.
Failed to destroy process 12048
libcore.io.ErrnoException: kill failed: ESRCH (No such process)
at libcore.io.Posix.kill(Native Method)
at libcore.io.ForwardingOs.kill(ForwardingOs.java:86)
at java.lang.ProcessManager$ProcessImpl.destroy(ProcessManager.java:260)
at anywheresoftware.b4a.phone.Phone$LogCat.LogCatStop(Phone.java:773)
at anywheresoftware.b4a.b4abridge.service1._stoplogcat(service1.java:638)
at anywheresoftware.b4a.b4abridge.service1._streams_newdata(service1.java:699)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
at anywheresoftware.b4a.BA$3.run(BA.java:320)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5586)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
Failed to destroy process 12048
libcore.io.ErrnoException: kill failed: ESRCH (No such process)
at libcore.io.Posix.kill(Native Method)
at libcore.io.ForwardingOs.kill(ForwardingOs.java:86)
at java.lang.ProcessManager$ProcessImpl.destroy(ProcessManager.java:260)
at anywheresoftware.b4a.phone.Phone$LogCat.LogCatStop(Phone.java:773)
at anywheresoftware.b4a.phone.Phone$LogCat.LogCatStart(Phone.java:718)
at anywheresoftware.b4a.b4abridge.service1._startlogcat(service1.java:631)
at anywheresoftware.b4a.b4abridge.service1._streams_newdata(service1.java:695)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
at anywheresoftware.b4a.BA$3.run(BA.java:320)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5586)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
Searching for devices
null, D6:FC:13:0F:37:8D
Discovering services.

Erel · Jan 19, 2015

Is the Connected event raised?

Denny Hopp · Jan 19, 2015

bioident -- can you paste your code to this forum that you use for searching for devices?

bioident · Jan 20, 2015

I use standard Erel code

bioident · Jan 20, 2015

Erel said:
Is the Connected event raised?

I have not received the Connected event
Only search and discovery finished.

Erel · Jan 21, 2015

I don't completely understand the logs you posted. Are you calling Connect more than one time?

bioident · Jan 21, 2015

Erel said:
I don't completely understand the logs you posted. Are you calling Connect more than one time?

yes i try connect many times by click screen

Erel · Jan 21, 2015

Click once and wait for the Connected or Disconnected events to fire. If the Disconnected event fired then the connection has failed.

bioident · Jan 25, 2015

Dear Erel,

If I click once i only have one search and program is like freezing .
DO nothing
No any connect / disconnect.

LOG:

LogCat connected to: B4A-Bridge: samsung SM-G900F
--------- beginning of /dev/log/main

Installing file.
** Activity (main) Pause, UserClosed = false **
PackageAdded: package:ble.RG
** Activity (main) Create, isFirst = true **
Supported: true
** Activity (main) Resume **
Searching for devices
null, D6:FC:13:0F:37:8D

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