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From:   Barry Byford <31baz66@gmail.com>
Date:   Wed, 22 Jul 2020 09:32:30 +0100
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Subject: Re: Networking - NetworkServer1
To:     Bluez mailing list <linux-bluetooth@vger.kernel.org>
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Hi Luiz,

Thanks for the quick response. Very much appreciated.

On Wed, 22 Jul 2020 at 00:27, Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
> > =3D bluetoothd: bnep: Can't add bnep0 to the bridge tether: No such
> > device(19)                     21:54:01.138304
>
> Well it looks like the bridge (tether) does not exist so we can't add
> the bnep interface, perhaps the idea is not to have it attached to any
> bridge in case of GN, PAN and just bring the interface up when an
> empty string is given as bridge.
>
An empty string also produced the error.

However, I created a bridge using the bridge utilities package
$ sudo apt install bridge-utils
$ sudo brctl addbr bluez

And then used
server.Register('panu', 'bluez')

This enabled the connection to be accepted from the client to happen
without error.

$ service bluetooth status
=E2=97=8F bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled;
vendor preset: enabled)
   Active: active (running) since Tue 2020-07-21 09:27:49 BST; 24h ago
     Docs: man:bluetoothd(8)
 Main PID: 625 (bluetoothd)
   Status: "Running"
    Tasks: 1 (limit: 2200)
   Memory: 3.3M
   CGroup: /system.slice/bluetooth.service
           =E2=94=94=E2=94=80625 /usr/lib/bluetooth/bluetoothd --experiment=
al

Jul 22 07:27:43 raspberrypi bluetoothd[625]: bnep: bridge bluez:
interface bnep0 added


I think the bridge probably needs more refinement as there does not
appear to be a route between the two devices still.

Any pointers on that appreciated.

Thanks again for your help on this Luiz.

Regards,
Barry


$ brctl show
bridge name     bridge id               STP enabled     interfaces
bluez           8000.b827eb2257e0       no              bnep0

$ brctl showstp bluez
bluez
 bridge id              8000.b827eb2257e0
 designated root        8000.b827eb2257e0
 root port                 0                    path cost                  =
0
 max age                  20.00                 bridge max age            2=
0.00
 hello time                2.00                 bridge hello time          =
2.00
 forward delay            15.00                 bridge forward delay      1=
5.00
 ageing time             300.00
 hello timer               0.00                 tcn timer                  =
0.00
 topology change timer     0.00                 gc timer                   =
0.00
 flags


bnep0 (1)
 port id                8001                    state                  disa=
bled
 designated root        8000.b827eb2257e0       path cost                10=
0
 designated bridge      8000.b827eb2257e0       message age timer          =
0.00
 designated port        8001                    forward delay timer        =
0.00
 designated cost           0                    hold timer                 =
0.00
 flags

$ ifconfig bluez
bluez: flags=3D4098<BROADCAST,MULTICAST>  mtu 1500
        ether b8:27:eb:22:57:e0  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

$ ifconfig bnep0
bnep0: flags=3D4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.91.109  netmask 255.255.0.0  broadcast 169.254.255.255
        inet6 fe80::ba27:ebff:fe22:57e0  prefixlen 64  scopeid 0x20<link>
        inet6 fe80::64d6:60a1:4a0d:3e4  prefixlen 64  scopeid 0x20<link>
        ether b8:27:eb:22:57:e0  txqueuelen 1000  (Ethernet)
        RX packets 111  bytes 20669 (20.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 57  bytes 16084 (15.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Ifa=
ce
0.0.0.0         192.168.1.254   0.0.0.0         UG    202    0        0 eth=
0
169.254.0.0     0.0.0.0         255.255.0.0     U     233    0        0 bne=
p0
192.168.1.0     0.0.0.0         255.255.255.0   U     202    0        0 eth=
0