Trying to use Ethernet over Bluetooth between Pi boards

Question

I'm trying to use SSH over Bluetooth via Ethernet over Blutooth. I've based my effort thus far on: Bluetooth PAN Network Setup with BlueZ 5.X

I believe I have faithfully followed the instructions. The instruction require server and client side systemd services be created: net-bnep.service and net-bnep-client.service, respectively.

In addition, there's bt-pan, a Python script (courtsey of GiTHub). The script is invoked on both sides. Finally, there's a bridge to be created as the "connection point":

#!/bin/bash

br=bnep

[[ -n "$(brctl show $br 2>&1 1>/dev/null)" ]] && {
  brctl addbr $br
  brctl setfd $br 0
  brctl stp $br off
  ip addr add 10.1.2.3/24 dev $br
  ip link set $br up
}

exec bt-pan --debug server $br

When I try to check on the status of the server side service, everything appears OK. But on the client side, the service is dead with the message

Method "Connect" with signature 's' on org.bluez.Network1 doesn't exist.

Using d-feet it couldn't find a service org.bluez.Network1, let alone a method Connect.

Anyone besides me trying to accomplish the same thing?

BTW, if you look at the latest BlueZ on GitHub, you'll see it includes a suite of test utilities, one in particular: bneptest. This utility supposedly can be used for the same purpose, Ethernet over Bluetooth.

I cloned, built, and installed the Git repository. Now trying bneptest.