bluetooth lowenergy - Android BLE BluetoothGatt object remains connected and triggers onCharacteristicChanged() even after a call to disconnect() -


i trying disconnect characteristic notifications exiting app. here how doing in exitcleanup() function:

if (btgatt != null && mwritechar != null) {    boolean b=btgatt.setcharacteristicnotification(mwritechar, false);    log.w("appinfo", "exiting , unsubscribing: " + b); }

the log shows: exiting , unsubscribing: true. far good. attempt disconnect gatt object altogether using following:

if (btgatt != null && btmanager!=null && btmanager.getconnectionstate(btdevice, bluetoothprofile.gatt) != bluetoothprofile.state_disconnected ) {     //making sure gatt , bt manager still     //also making sure connection state not disconnected     btgatt.disconnect();     btgatt.close();     log.w( "appinfo", "finishing. connection state=" + btmanager.getconnectionstate(btdevice, bluetoothprofile.gatt) ); }

this things weird. log displays following: finishing. connection state=2, indicating bluetoothdevice still connected.

this problem, because when app finishes , destroys assets, bluetoothgattcallback still continues receive notifications behind scenes. first throws following nullpointerexception:

04-25 22:49:54.392  17280-17293/com.myapp.appinfo d/bluetoothgatt﹕ onclientconnectionstate() - status=0 clientif=8 device=54:4a:16:26:a1:b5 04-25 22:49:54.392  17280-17293/com.myapp.appinfo w/bluetoothgatt﹕ unhandled exception in callback java.lang.nullpointerexception         @ android.bluetooth.bluetoothgatt$1.onclientconnectionstate(bluetoothgatt.java:168)         @ android.bluetooth.ibluetoothgattcallback$stub.ontransact(ibluetoothgattcallback.java:71)         @ android.os.binder.exectransact(binder.java:404)         @ dalvik.system.nativestart.run(native method) 04-25 22:49:54.402  17280-17280/com.myapp.appinfo d/bluetoothmanager﹕ getconnectionstate()

and continues publish onnotify() calls trigger oncharacteristicchanged() calls after app has terminated awile ago:

d/bluetoothgatt﹕ onnotify() - device=54:4a:16:26:a1:b5 uuid=0000ffe1-0000-1000-8000-00805f9b34fb

any advice on how disconnect gatt characteristic notifications when exiting app?

it seems can't call these method together. disconnection callback might arrive later close() method performed.

you can add mgatt.close(); onconnectionstatechange callback close connection.

https://code.google.com/p/android/issues/detail?id=183108


Comments

Post a Comment

Popular posts from this blog

asp.net mvc - SSO between MVCForum and Umbraco7 -

i need integrate sso between mvcforum (forum of company) , umbraco7 (manages cms company). however struggling shared authentication work. tried several ways suggested on other threads still not running expected. here did: 1. in mvcforum (forum.mywebsite.com) 1.1. machine key in web.xml: <machinekey validationkey="the same key umbraco7" decryptionkey="the same key umbraco7" validation="sha1" decryption="aes" /> 1.2. authenticate forms in web.xml <forms name="my-sso-auth" protection="all" path="/" timeout="43200" domain="forum.mywebsite.com" loginurl="/members/logon" enablecrossappredirects="true" /> 2. in umbraco7 (news.mywebsite.com) 2.1. machine key in web.xml: <machinekey validationkey="the same key mvcforum" decryptionkey="the same key mvcforum" validation="sha1" decryption="aes" /> 2.2. a
Read more

Python Tkinter keyboard using bind -

i have problem using bind option can click button in keyboard, , call function once key pressed. tried taking other codes have similar purpose , saw i'm doing pretty same, though still have problem must've missed. thankful if me this. here's code: # -*- coding: utf-8 -*- #imports tkinter import * pil import imagetk, image import time import tkmessagebox #===========================================================================================================================================# #tkinter class class app(frame): def __init__(self, master=none): frame.__init__(self, master) self.pack() #===========================================================================================================================================# #game pieces classes class board: def __init__(self, rows = 7, columns = 6, picture_height = none, picture_width = none): self.rows = rows self.columns = columns self.picture
Read more

ubuntu - Selenium Node Not Connecting to Hub, Not Opening Port -

i'm trying set demo selenium grid. have digital ocean ubuntu 14.02 droplet. (i have 2 , tried set using 2 different machines got nowhere.) i'm trying run hub , node both locally. here input both hub, node, , nmap results. https://gist.github.com/mekhami/d5bbecca5ff0de9d2dc9 so, node starting tcp connection reset , port it's supposed operate on closed. i have had no luck in number of different options , configurations work. but... of course, worked randomly once. don't know why, don't know did, know 1 brief moment, node connected , saw on grid console. tried run test , went down again , i've never seen come up. please let me know more information can provide. update: randomly came online again. don't know happened, might related timeout or time_wait or going on. this because vm/server not have enough entropy available. to resolve problem, install haveged (or other similar things). the instructions of how install haveged on ubu
Read more