Bluetooth connection to OSTC2 Rev 2017 fails on Ubuntu 17.04

[Aaron Scheiner]

Hi

I just installed the updated testing version of Subsurface from the
PPA repository (4.6.4-1003). For some reason it can't connect to my
OSTC2 (rev 2017) via Bluetooth. I'm running Ubuntu 17.04. I'm fairly
sure this wasn't an issue in the past.

The device in question in the list below is "00:80:25:CC:9B:EE" "OSTC+ 15909".
Connections to OSTC Sport #13246 and OSTC Sport #12887 are successful.

qt.bluetooth.bluez: Bluez 5 detected.
qt.bluetooth.bluez: Creating QtBluezDiscoveryManager
qt.bluetooth.bluez: Discovered:  "00:80:25:4A:3B:8E" "OSTCs 12887" Num
UUIDs 2 total device 0 cached RSSI 0 Class 7936
qt.bluetooth.bluez: Discovered:  "00:80:25:4A:D0:0C" "OSTC3#04897" Num
UUIDs 2 total device 1 cached RSSI 0 Class 7936
qt.bluetooth.bluez: Discovered:  "00:80:25:4A:D4:B9" "OSTCs 13246" Num
UUIDs 5 total device 2 cached RSSI 0 Class 7936
qt.bluetooth.bluez: Discovered:  "00:80:25:CC:9B:EE" "OSTC+ 15909" Num
UUIDs 2 total device 3 cached RSSI 0 Class 7936
qt.bluetooth.bluez: Discovered:  "FD:XX:XX:XX:XX:XX" "Perdix" Num
UUIDs 3 total device 4 cached RSSI 0 Class 0
qt.bluetooth.bluez: Updating RSSI for "00:80:25:CC:9B:EE" QVariant(short, -67)
qt.bluetooth.bluez: void QBluetoothDeviceDiscoveryAgentPrivate::stop()
qt.bluetooth.bluez: void QBluetoothSocketPrivate::_q_readNotify() 42
error: -1 "Resource temporarily unavailable"
Connection on channel 1 failed. Trying on channel number 5.
Failed to connect to device  00:80:25:CC:9B:EE . Device state
QBluetoothSocket::UnconnectedState . Error:
QBluetoothSocket::UnknownSocketError
[10.113540] ERROR: Failed to open the serial port. [in hw_ostc3.c:344
(hw_ostc3_device_open)]

Aaron