here is a summary and a logcat trace

Problem # 1:  Non-stop advertisements
The chromebook does not clear some type of cache of advertisements. The log below shows two advertisements being continuously reported by the scanner even though the device with address 00:1C:05:FF:E8:75 is a device that was connected at the office the day before and the device with address 00:1C:05:FF:E8:74 is one connected today. However, the batteries are out of the device and a Bluetooth sniffer shows no activity from the device.
Both of these devices are Nonin 3230 pulse oximeters.
The application scans for known devices and when it finds one it firsts asks the user if a connection to it is desired. If so, a connection attempt is made. The scanner stops and restarts when a connection is made. After that, since the device is known, when it sees the device again, it reconnects.
So what happens is that these advertisements from a non-existent device are received, the scanner stops, a connection attempt is made, and since the device does not exist, it will never connect. The scanner restarts after a 61 second timeout.  The connection attempt eventually fails.
The cycle repeats indefinitely. Reboot does not solve the issue.
It appears if one unpairs with the device, the spurious advertisements are no longer received.
Here is a log

09-01 08:50:52.635 2622-2622/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleAdapter: Accepted Advertisement packet from device 00:1C:05:FF:E8:74
    02 01 06 14 09 4E 6F 6E 69 6E 33 32 33 30 5F 35 30 31 39 30 30 30 38 33 11 07 1B C5 D5 A5 02 00 5E 8B E2 11 5F 0D E0 70 A9 46 0B 03 0F 18 22 18 05 18 0A 18 00 18 00 00 00 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 68 00 00 00 06 00 00 00 10 00 00 00 00 00 00 00 58 00 00 00 00 00 00 00 10 00 00 00 01 00 00 00 68 00 00 00 00 00 00
09-01 08:50:52.635 2622-2622/2 I/.BtScanner: Pause scan being called. Current state false
09-01 08:50:52.635 2622-2654/2 I/.BtScanner: Scan loop being paused during Btle scan for 61000 ms
    Scan loop now being paused for 61000
09-01 08:50:52.735 2622-2622/2 I/.BtScanner: Pause scan finished. Current state true
09-01 08:50:52.736 2622-2622/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleAdapter: Known Device; already have handler but Use First time connect.
09-01 08:50:52.741 2622-2622/2 D/BluetoothGatt: connect() - device: 00:1C:05:FF:E8:74, auto: false
    registerApp()
    registerApp() - UUID=988425d1-09ea-4f4c-b554-78b9b43018fe
09-01 08:50:52.742 2622-2634/2 D/BluetoothGatt: onClientRegistered() - status=0 clientIf=228
09-01 08:50:52.745 2622-2622/2 D/BluetoothAdapter: STATE_ON
09-01 08:50:52.748 2622-2622/2 D/BluetoothAdapter: STATE_ON
09-01 08:50:52.749 2622-2622/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleAdapter: Accepted Advertisement packet from device 00:1C:05:FF:E8:75
    14 09 4E 6F 6E 69 6E 33 32 33 30 5F 35 30 31 39 30 30 30 38 32 11 07 1B C5 D5 A5 02 00 5E 8B E2 11 5F 0D E0 70 A9 46 0B 03 0F 18 22 18 05 18 0A 18 00 18 00 00 00 00 00 00 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 68 00 00 00 06 00 00 00 10 00 00 00 00 00 00 00 58 00 00 00 00 00 00 00 10 00 00 00 01 00 00 00 68 00 00 00 00 00 00
09-01 08:50:52.749 2622-2622/2 I/.BtScanner: Pause scan being called. Current state true
    Pause scan finished. Current state true
09-01 08:50:52.749 2622-2622/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleAdapter: Known Device; already have handler but Use First time connect.
09-01 08:50:52.751 2622-2654/2 I/.BtScanner: Pause was woken up
    Scan loop being re-paused.
    Scan loop now being paused for 61000
09-01 08:50:52.753 2622-2622/2 D/BluetoothGatt: connect() - device: 00:1C:05:FF:E8:75, auto: false
    registerApp()
    registerApp() - UUID=51d8fbe2-6473-4347-bb14-5f1081651022
09-01 08:50:52.754 2622-2634/2 D/BluetoothGatt: onClientRegistered() - status=0 clientIf=229
09-01 08:51:32.811 2622-2635/2 D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=229 device=00:1C:05:FF:E8:75
09-01 08:51:32.814 2622-2635/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: Connection State change indication received from BTLE device Nonin3230_501900082 with address 00:1C:05:FF:E8:75 with state 0
09-01 08:51:32.816 2622-2635/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: Premature disconnect; connection not etablished. Restart scans. Status 0
09-01 08:51:32.819 2622-2634/2 D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=228 device=00:1C:05:FF:E8:74
09-01 08:51:32.821 2622-2634/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: Connection State change indication received from BTLE device Nonin3230_501900083 with address 00:1C:05:FF:E8:74 with state 0
09-01 08:51:32.823 2622-2634/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: Premature disconnect; connection not etablished. Restart scans. Status 0
09-01 08:51:34.817 2622-2635/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: BTLE device has disconnected. Cancelling any remaining countdowns.
09-01 08:51:34.817 2622-2635/2 D/BluetoothGatt: close()
    unregisterApp() - mClientIf=229
09-01 08:51:34.817 2622-2654/2 I/.BtScanner: Pause was woken up
    Scan loop resumed.
    Pause handler ended.
09-01 08:51:34.826 2622-2635/2 I/.BluetoothPanService: Disconnect indication received from a BTLE device with address 00:1C:05:FF:E8:75 and system Id 0x System Id has not yet been obtained
09-01 08:51:34.826 2622-2635/2 I/.MeasurementLogActivity: Disconnect indication received from a BTLE device with address 00:1C:05:FF:E8:75 and system Id 0x System Id has not yet been obtained
09-01 08:51:36.817 2622-2634/2 I/.BtScanner: Scan loop already going
09-01 08:51:36.818 2622-2634/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: BTLE device has disconnected. Cancelling any remaining countdowns.
09-01 08:51:36.818 2622-2634/2 D/BluetoothGatt: close()
    unregisterApp() - mClientIf=228
09-01 08:51:36.824 2622-2634/2 I/.BluetoothPanService: Disconnect indication received from a BTLE device with address 00:1C:05:FF:E8:74 and system Id 0x System Id has not yet been obtained
09-01 08:51:36.824 2622-2634/2 I/.MeasurementLogActivity: Disconnect indication received from a BTLE device with address 00:1C:05:FF:E8:74 and system Id 0x System Id has not yet been obtained
09-01 08:51:39.836 2622-2622/2 D/BluetoothAdapter: STATE_ON
09-01 08:51:39.844 2622-2635/2 D/BluetoothLeScanner: onClientRegistered() - status=0 clientIf=230 mClientIf=0
09-01 08:51:40.074 2622-2622/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleAdapter: Accepted Advertisement packet from device 00:1C:05:FF:E8:74
    02 01 06 14 09 4E 6F 6E 69 6E 33 32 33 30 5F 35 30 31 39 30 30 30 38 33 11 07 1B C5 D5 A5 02 00 5E 8B E2 11 5F 0D E0 70 A9 46 0B 03 0F 18 22 18 05 18 0A 18 00 18 00 00 00 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 68 00 00 00 06 00 00 00 10 00 00 00 00 00 00 00 58 00 00 00 00 00 00 00 10 00 00 00 01 00 00 00 68 00 00 00 00 00 00
09-01 08:51:40.075 2622-2622/2 I/.BtScanner: Pause scan being called. Current state false
09-01 08:51:40.075 2622-2654/2 I/.BtScanner: Scan loop being paused during Btle scan for 61000 ms
    Scan loop now being paused for 61000
09-01 08:51:40.175 2622-2622/2 I/.BtScanner: Pause scan finished. Current state true
09-01 08:51:40.175 2622-2622/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleAdapter: Known Device; already have handler but Use First time connect.
09-01 08:51:40.180 2622-2622/2 D/BluetoothGatt: connect() - device: 00:1C:05:FF:E8:74, auto: false
    registerApp()
    registerApp() - UUID=15485073-ce08-4dac-b943-9c723b5dfde2
09-01 08:51:40.181 2622-2635/2 D/BluetoothGatt: onClientRegistered() - status=0 clientIf=231
09-01 08:51:40.184 2622-2622/2 D/BluetoothAdapter: STATE_ON
09-01 08:51:40.186 2622-2622/2 D/BluetoothAdapter: STATE_ON
09-01 08:51:40.189 2622-2622/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleAdapter: Accepted Advertisement packet from device 00:1C:05:FF:E8:75
    14 09 4E 6F 6E 69 6E 33 32 33 30 5F 35 30 31 39 30 30 30 38 32 11 07 1B C5 D5 A5 02 00 5E 8B E2 11 5F 0D E0 70 A9 46 0B 03 0F 18 22 18 05 18 0A 18 00 18 00 00 00 00 00 00 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 68 00 00 00 06 00 00 00 10 00 00 00 00 00 00 00 58 00 00 00 00 00 00 00 10 00 00 00 01 00 00 00 68 00 00 00 00 00 00
09-01 08:51:40.189 2622-2622/2 I/.BtScanner: Pause scan being called. Current state true
09-01 08:51:40.190 2622-2622/2 I/.BtScanner: Pause scan finished. Current state true
09-01 08:51:40.190 2622-2622/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleAdapter: Known Device; already have handler but Use First time connect.
09-01 08:51:40.191 2622-2654/2 I/.BtScanner: Pause was woken up
    Scan loop being re-paused.
    Scan loop now being paused for 61000
09-01 08:51:40.191 2622-2622/2 D/BluetoothGatt: connect() - device: 00:1C:05:FF:E8:75, auto: false
    registerApp()
    registerApp() - UUID=02e94db5-1ee0-4dce-b4d7-272477e81e2c
09-01 08:51:40.197 2622-2635/2 D/BluetoothGatt: onClientRegistered() - status=0 clientIf=232
09-01 08:52:20.298 2622-2665/2 D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=232 device=00:1C:05:FF:E8:75
09-01 08:52:20.300 2622-2665/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: Connection State change indication received from BTLE device Nonin3230_501900082 with address 00:1C:05:FF:E8:75 with state 0
09-01 08:52:20.303 2622-2665/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: Premature disconnect; connection not etablished. Restart scans. Status 0
09-01 08:52:20.307 2622-2635/2 D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=231 device=00:1C:05:FF:E8:74
09-01 08:52:20.309 2622-2635/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: Connection State change indication received from BTLE device Nonin3230_501900083 with address 00:1C:05:FF:E8:74 with state 0
09-01 08:52:20.311 2622-2635/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: Premature disconnect; connection not etablished. Restart scans. Status 0
09-01 08:52:22.303 2622-2665/2 I/com.lampreynetworks.ahd.transport.btle.AndroidBtleHandler: BTLE device has disconnected. Cancelling any remaining countdowns.
09-01 08:52:22.303 2622-2665/2 D/BluetoothGatt: close()
09-01 08:52:22.304 2622-2665/2 D/BluetoothGatt: unregisterApp() - mClientIf=232
09-01 08:52:22.304 2622-2654/2 I/.BtScanner: Pause was woken up
    Scan loop resumed.
    Pause handler ended

Thanks for filing the issue!

Struck at installing the BLE Scanner on the device as updated in Issue:  880538 .

Thanks!

If you are able to install the LniPlugfestPHG that I mentioned in Issue:  880538  the next step you need to do is pair with a BTLE health device supported by the application. All BTLE health devices following the standard are supported.

To pair run the application and do something to make the BTLE health device pairable. What that is will depend upon the device. With some devices all you need to is to take a measurement.

The application will popup a screen asking if you want to connect to the device. Select yes. Pairing will happen automatically if the device asks to be paired. YOu may need to answer confirmation dialogs aking if you want to pair with the device. For some devices you will be prompted to enter a passkey.

A&D BTLE devices require that you set them in a pairing mode. THis is usually done by holding down the power button until a pairing signal is displayed on the UI. Learning your devices will probably be the hardest part. THey all do the same thing in different ways.

I should have added that once paired, you can turn off your medical device, walk into another room, and advertisements from that devices will continue to be sent to the application. These spurious ads will continue until you unpair.

The advertisements will cause the app to attempt to connect to the device, but since it does not exist, no connection will occur. The scanner is turned off while connecting since the scan channel and connection attempt channels are the same. Once connected, different channels are used and the scanner restarts.

Since no connection happens, the attempt is killed after 61 seconds and the scanner restarted. A new connection attempt will occurs on the next ad and the process repeats indefinitely.

Could you please provide your confirmation that can we change the OS to 'Chrome' as this issue is related to Android platform (as mentioned in comment# 5 & 7 in Issue:  880538 ), hence adding Needs-Feedback label to it.

Thanks!

qiyuh, is this an issue w/ caching? Can you take a look? Thanks!