It looks like you only read the question you linked to, not the answers. The question specifically asks why the command you mentioned doesn't work, and Rhaegar's answer explains what you have to do instead. – Dan Hulme May 2 '16 at 6:48
The HCI log file is now being generated and is saved to /sdcard/btsnoop_hci.log. Note: Samsung devices have a slightly different location for the btsnoop file. There are two options for retrieving the HCI log from the Android device. Attach the Android device to your computer.
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A Bluetooth HCI (Host Controller Interface) snoop log is a log file that contains all the Bluetooth transmissions that you have made. In all gadgets with android developer settings, beginning with android 4.4, the log choice is in existence. How to create HCI log.
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Is btsnoop_hci.log useful? I tried enabling that in developer options, but after using the Go+ with the game for an hour then rebooting the phone, the file didn't contain anything of obvious use when analysed in Wireshark - I would expect to find UUIDs or the string 'Pokemon GO Plus' somewhere but didn't.
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Client Actions: Discover, Read, Write, Conﬁrm an Indication Server Actions: respond to Client actions, send Notiﬁcations ... -> /sdcard/btsnoop_hci.log . Some BLE ...
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a9cc65f: Add btsnoop_hci.log to bugreport zip (1/2) 304f781 : Allow both RENDER and TEXTURE flags when creating native client buffers. 3b36bcf : IServiceManager: Improve getService responsiveness in absence of service