OSTC Sport bluetooth problem with Linux

Stephen Hemminger stephen at networkplumber.org
Mon Apr 3 18:06:45 PDT 2017

I am running Debian Stretch with current AppImage version of Subsurface.
Trying to download dives from OSTC Sport.

The Bluetooth pairing is successful and the rfcomm connection comes up, but
the serial port won't open.

# rfcomm -i hci0 connect rfcomm0 00:80:25:4A:10:77 1
Connected /dev/rfcomm0 to 00:80:25:4A:10:77 on channel 1
Press CTRL-C for hangup
[0.003838] ERROR: Input/output error (5) [in ../../src/serial_posix.c:198
[0.003927] ERROR: Failed to open the serial port. [in
../../src/hw_ostc3.c:344 (hw_ostc3_device_open)]

Possibly related dmesg
[  482.059744] Bluetooth: TIOCGSERIAL is not supported
[  482.060272] Bluetooth: TIOCGSERIAL is not supported
[  488.060994] Bluetooth: TIOCGSERIAL is not supported

Running stock Debian kernel which is 4.9..

PS: Is bluetooth always this much of a a pain or is it just Linux?
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