android - 'App is scanning too frequently' with ScanSettings.SCAN_MODE_OPPORTUNISTIC -


we found issue on samsung s8, android 7.0 (upd. happens on android 7.0: samsung s7, nexus 5x), tells, after couple of tests, app scanning frequently:

08-14 12:44:20.693 25329-25329/com.my.app d/bluetoothadapter: startlescan(): null 08-14 12:44:20.695 25329-25329/com.my.app d/bluetoothadapter: state_on 08-14 12:44:20.696 25329-25329/com.my.app d/bluetoothadapter: state_on 08-14 12:44:20.698 25329-25329/com.my.app d/bluetoothlescanner: start scan 08-14 12:44:20.699 25329-25329/com.my.app d/bluetoothadapter: state_on 08-14 12:44:20.700 25329-25329/com.my.app d/bluetoothadapter: state_on 08-14 12:44:20.700 25329-25329/com.my.app d/bluetoothadapter: state_on 08-14 12:44:20.701 25329-25329/com.my.app d/bluetoothadapter: state_on 08-14 12:44:20.703 4079-4093/? d/btgatt.gattservice: registerclient() - uuid=dbaafee1-caf1-4482-9025-b712f000eeab 08-14 12:44:20.807 4079-4204/? d/btgatt.gattservice: onclientregistered() - uuid=dbaafee1-caf1-4482-9025-b712f000eeab, clientif=5, status=0 08-14 12:44:20.808 25329-25342/com.my.app d/bluetoothlescanner: onclientregistered() - status=0 clientif=5 mclientif=0 08-14 12:44:20.809 4079-7185/? d/btgatt.gattservice: start scan filters 08-14 12:44:20.811 4079-7185/? d/btgatt.gattservice: getscansettings  08-14 12:44:20.812 4079-7185/? d/btgatt.gattservice: foreground application = true 08-14 12:44:20.812 4079-7185/? d/btgatt.gattservice: not background application 08-14 12:44:20.817 4079-7185/? e/btgatt.gattservice: app 'com.my.app' scanning

the problem lies in 6 state_on call results, it's part of undocumented ble behavior change, first mentioned in dp4 release notes:

we’ve changed ble scanning behavior starting in dp4. we’ll prevent applications starting , stopping scans more 5 times in 30 seconds. long running scans, we’ll convert them opportunistic scans.

what don't these 6 scans in less 30s if set scansettings.setscanmode(scansettings.scan_mode_opportunistic).

the code is:

            list<scanfilter> filters = new arraylist<>();             scansettings scansettings = new scansettings.builder()                     .setscanmode(scansettings.scan_mode_opportunistic)                     .build();             bluetoothadapter.getbluetoothlescanner().startscan(filters, scansettings, recoderscancallback);             //events log happen before log printed             log.i("test", " started!");             return recoderscancallback.scanresultobservable().map((scanresult record) -> {                  //never gets here                  log.i("test", " result!");             });

recorderscancallback derived scancallback. cannot use rxandroidble#rxbleclient.scanblesettings(scansettings) because our code freeze , use 1.1.0 version of lib.

why scansettings.setscanmode not alter results of search?


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more