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From:   Grigory Fateyev <gfborn@gmail.com>
Date:   Wed, 23 Jan 2019 19:18:42 +0300
Message-ID: <CAAOqupyyrt4_3=1-8rHVoWFAKLX=adE3PopwTfczUCga=4k7gg@mail.gmail.com>
Subject: Battery level of energy
To:     linux-bluetooth@vger.kernel.org
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Hello!

I have a bluetooth headset Sony MDR-XB650BT.

# hcitool info 00:18:09:C5:44:1E
Requesting information ...
BD Address:  00:18:09:C5:44:1E
OUI Company: CRESYN (00-18-09)
Device Name: MDR-XB650BT
LMP Version: 4.0 (0x6) LMP Subversion: 0x2576
Manufacturer: Cambridge Silicon Radio (10)
Features page 0: 0xff 0xff 0x8f 0xfe 0x9b 0xff 0x59 0x87
<3-slot packets> <5-slot packets> <encryption> <slot offset>
<timing accuracy> <role switch> <hold mode> <sniff mode>
<park state> <RSSI> <channel quality> <SCO link> <HV2 packets>
<HV3 packets> <u-law log> <A-law log> <CVSD> <paging scheme>
<power control> <transparent SCO> <broadcast encrypt>
<EDR ACL 2 Mbps> <EDR ACL 3 Mbps> <enhanced iscan>
<interlaced iscan> <interlaced pscan> <inquiry with RSSI>
<extended SCO> <EV4 packets> <EV5 packets> <AFH cap. slave>
<AFH class. slave> <3-slot EDR ACL> <5-slot EDR ACL>
<sniff subrating> <pause encryption> <AFH cap. master>
<AFH class. master> <EDR eSCO 2 Mbps> <EDR eSCO 3 Mbps>
<3-slot EDR eSCO> <extended inquiry> <simple pairing>
<encapsulated PDU> <non-flush flag> <LSTO> <inquiry TX power>
<EPC> <extended features>
Features page 1: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00

I'd like to get the energy level at least in shell. In which direction
I should look for? How to know if my device has GATT support? If it
connected with Android smartphone, where Android version is < 6.0, it
has an icon with level in percents. I want to get the same on my linux
machine.

Thank you!

-- 
Grigory