Running BTBench between Android Device and UbuntuHost

[jaisontj]

I am trying to run bumble-bench between an ubuntu host and an Android Device (using the BTBench app)

What I'm doing,

Android device

# Build and install BTBench
# Start in RFCOMM server mode
adb shell am start -n com.github.google.bumble.btbench/.MainActivity --es autostart rfcomm-server

Ubuntu Host

# $USB is the BT transport
# D4:3A:2C:53:29:BC is the BT address of the Android device that I got from the device's About page
python3 apps/bench.py --mode rfcomm-client --packet-count 100 central --peripheral D4:3A:2C:53:29:BC/P $USB

Output

$ python3 apps/bench.py --mode rfcomm-client --packet-count 100 central --peripheral D4:3A:2C:53:29:BC/P $USB
INFO:root:>>> Connecting to HCI...
INFO:root:>>> Connected
INFO:root:### Connecting to D4:3A:2C:53:29:BC/P...
INFO:root:### Connected
INFO:root:@@@ Connection:    MTU=23
WARNING:bumble.host:--- Ignoring event HCI_CONNECTION_PACKET_TYPE_CHANGED_EVENT:
  status:            HCI_SUCCESS
  connection_handle: 50
  packet_type:       52248
WARNING:bumble.host:--- Ignoring event HCI_CONNECTION_PACKET_TYPE_CHANGED_EVENT:
  status:            HCI_SUCCESS
  connection_handle: 50
  packet_type:       52248
INFO:root:*** Starting RFCOMM client...
INFO:root:!!! Disconnection: reason=5

I'm not entirely sure what "reason=5" is.

Any idea what I maybe doing wrong?

[barbibulle]

Android requires an encrypted connection for RFComm sockets to be connected.
There are several ways to enable encryption:
1/ temporarily, by using the --encrypt option for the central command.
2/ more permanently, by pairing. You can use the bumble-pair with the --mode classic option to pair with the Android phone. The pairing key will be stored in the default key store (location is platform-dependent, the logs, when DEBUG logging is enabled, will show the path of the JSON file where the pairing keys are stored).