Android Question Bluetooth LE Manager_DeviceFound - error

[wstein25]

I have a Bluetooth LE device that advertises every 3 seconds. The following is the beginning of the sub that handles it when found:

Sub Manager_DeviceFound (Name As String, Id As String, AdvertisingData As Map, RSSI As Double)
Log("Found: " & Name & ", " & Id & ", RSSI = " & RSSI & ", " & AdvertisingData)
If Name = "Etesian" Then

Everything works fine - for a time, an then seemingly randomly the app crashes. The log states:



Found: Etesian, F6:01:67:24:72:09, RSSI = -72, (MyMap) {1=[B@1b5cd027, 25=[B@131ab2d4, 9=[B@28d2ec7d, -1=[B@b8af772, 0=[B@15bc47c3}
4135
81
10
Found: Etesian, F6:01:67:24:72:09, RSSI = -65, (MyMap) {1=[B@22fe02ca, 25=[B@3d3cec3b, 9=[B@138cbf58, -1=[B@b4a78b1, 0=[B@9618196}
4135
81
8
Found: Etesian, F6:01:67:24:72:09, RSSI = -63, (MyMap) {1=[B@2a5ceeed, 25=[B@12ac2122, 9=[B@27aea7b3, -1=[B@3e82170, 0=[B@30a68ce9}
4135
81
8
Found: Etesian, F6:01:67:24:72:09, RSSI = -61, (MyMap) {1=[B@30daae88, 25=[B@3379f021, 9=[B@2c9b7c46, -1=[B@2356e07, 0=[B@18b02b34}
4135
81
8
Found: null, 68:F5:37:9E:51A, RSSI = -59, (MyMap) {1=[B@13b0e3a3, -1=[B@3abec6a0, 0=[B@237f8259}
Error occurred on line: 76 (Starter)
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at b4a.BreezeView.starter._manager_devicefound(starter.java:176)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:702)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:336)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:246)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
at anywheresoftware.b4a.BA$2.run(BA.java:328)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5253)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:948)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:743)
** Activity (main) Resume **



Line 76 is If Name = "Etesian" Then

It would seem that some other Bluetooth ad was detected and this caused the crash? But why?

Thanks

Bill

 

[Erel]

Please use [code]code here...[/code] tags when posting code.

There is no name data in the second peripheral device so it returns Null. I will fix the library so it returns an empty string in that case. For now you should check it with:

If Name <> Null AND Name = "Etesian"

Note that you can pass the service UUID to Scan or Scan2 and it will then only find relevant devices.

Last tip. Use this sub to build the UUID:

Private Sub UUID(id As String) As String
#if B4A
   Return "0000" & id.ToLowerCase & "-0000-1000-8000-00805f9b34fb"
#else if B4I
   Return id.ToUpperCase
#End If
End Sub

You can then pass the 16 bits UUID.

 

[wstein25]

Erel,

Thanks for the fix. I'm letting the app run all day to see if it survives.

Regards,

Bill