bluetooth mesh

bluetooth mesh

[Cinaed Simson]

Hi - what are minum requirements for using mesh?

I'm in the process of installing the latest git version of bluez on 2 
single board computer ARM 64 odroid running stretch.

Both have 4.x kernels but I doubt if they have the crypotgraich kernel 
modules.

I'm doing this to learn about bluetooth mesh so I don't care about 
performance.

-- Cinaed

Re: bluetooth mesh

[Gix, Brian]

Hi Cinaed,

On Thu, 2021-06-03 at 15:49 -0700, Cinaed Simson wrote:
> Hi - what are minum requirements for using mesh?
> 
> I'm in the process of installing the latest git version of bluez on 2 
> single board computer ARM 64 odroid running stretch.
> 
> Both have 4.x kernels but I doubt if they have the crypotgraich kernel 
> modules.
> 
> I'm doing this to learn about bluetooth mesh so I don't care about 
> performance.
> 
> -- Cinaed

The README file in bluez is currently up to date, and thus the minimum requirements are currently:

1. A minimum of kernel version 4.9 or later is required

2. The kernel must at a minimum have the following .config options turned on:
	CONFIG_CRYPTO_USER
	CONFIG_CRYPTO_USER_API
	CONFIG_CRYPTO_USER_API_AEAD
	CONFIG_CRYPTO_USER_API_HASH

	CONFIG_CRYPTO_AES
	CONFIG_CRYPTO_CCM
	CONFIG_CRYPTO_AEAD
	CONFIG_CRYPTO_CMAC

Future versions of mesh will probably also require:

CONFIG_CRYPTO_HMAC
CONFIG_CRYPTO_SHA256

Re: Bluetooth mesh

[Michal Hobot]

Pierre-Henri,
The way Bluetooth mesh was designed to work is using advertising bearer. =
This allows mesh nodes to communicate by sending short bursts of data, =
allowing for effective and power-efficient communication.
There is also another bearer, used by the devices that cannot send and =
receive advertising packets in controlled way, like mobile phones. This =
bearer uses GATT connection to the mesh node that offers a service =
called GATT Proxy. Such a node is able to receive mesh messages tunneled =
over GATT connection and forward it to the mesh network using ADV =
bearer.

I'm not a BlueZ specialist but from what I can see, it supports just the =
GATT bearer. So you can use it to talk to "real" mesh nodes, but not =
really to be such a node.

Hope this helps,
Michal Hobot

> Wiadomo=C5=9B=C4=87 napisana przez Pierre-Henri Wibaut =
<wibautph@gmail.com> w dniu 22.11.2017, o godz. 16:04:
>=20
> Hi everyone,
>=20
> I=E2=80=99ve just seen that you added support for mesh in bluez. Nice!
> I wanted to know if building a mesh network is tricky or not for the
> moment. I already made a mesh network with NRF24L01 chips.
> I would like to switch to BT and bluez for future work, but has no
> experience in BT (anyway, always happy to learn).
>=20
> My setup would be meshing C.H.I.P
> (https://docs.getchip.com/chip.html#chip-hardware) together (chipset
> RTL8723BS)
> And raspberry pi 3. Both looks like supported by bluez and are >=3D4.0
> BT. Does it worth it to give it a try?
>=20
> Is the mesh specific to some hardware or any >=3D 4.0 chip does the =
job?
>=20
> Thank you for your answers.
>=20
> kind regards
>=20
> Wibaut PH
> Oxykube SCRL
> --
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