How many device can be connected in mesh light switch example.

RE: How many device can be connected in mesh light switch example.

Amanda Hsieh — Mon, 30 Sep 2024 19:09:34 GMT

Check out CONFIG_BT_MESH_FRIEND_LPN_COUNT.

RE: How many device can be connected in mesh light switch example.

cyriactoms — Sat, 28 Sep 2024 11:19:24 GMT

[00:02:31.869,659] <wrn> bt_mesh_friend: No free Friend contexts for new LPN

i got this message from friend node i have created.

I need to connect atleast 6 LPN nodes to the friend node. What is to be configured to connect that much lpn to the friend node.

RE: How many device can be connected in mesh light switch example.

cyriactoms — Fri, 27 Sep 2024 12:48:45 GMT

Is there any examples in nrf sdk to know how friend node , relay node, proxy node communicates other than light switch sample

RE: How many device can be connected in mesh light switch example.

cyriactoms — Fri, 27 Sep 2024 06:56:20 GMT

Thank You for the valuable answers.

RE: How many device can be connected in mesh light switch example.

Amanda Hsieh — Thu, 26 Sep 2024 19:48:54 GMT

[quote user="cyriactoms"]CONFIG_BT_MESH_RELAY=y it is given like this. is this only enough or should i need to do any other configuration other than this .[/quote]

That's correct. CONFIG_BT_MESH_RELAY can enable message relaying.

[quote user="cyriactoms"]does the friend node needs a relay node to communicate or it can communicate directly in mesh.?[/quote]

A Friend node can communicate directly with LPNs without a Relay node. However, if a mesh network only contains LPNs, the messages will not be relayed through the network without the use of a Relay node. This is because LPNs are in sleep mode most of the time and cannot relay messages when they are asleep. Relay nodes are responsible for forwarding messages in the network, extending the range of the network, and allowing messages to hop between multiple relay nodes. Therefore, in a mesh network composed only of LPNs, a Relay node would be necessary to ensure that messages are relayed through the network. See Bluetooth Mesh network topology and concepts

[quote user="cyriactoms"]what is the use of proxy and gatt bearer.?[/quote]

The Proxy node and GATT bearer allow Bluetooth LE devices that do not possess a Bluetooth mesh stack to interact with nodes in a mesh network. The Proxy node enables a legacy Bluetooth LE device to participate in the mesh network by establishing a GATT connection to a mesh device that has the proxy feature enabled. The GATT bearer is used for tunneling mesh messages over the Bluetooth LE GATT protocol.

RE: How many device can be connected in mesh light switch example.

cyriactoms — Thu, 26 Sep 2024 05:47:21 GMT

[quote userid="77782" url="~/f/nordic-q-a/114920/how-many-device-can-be-connected-in-mesh-light-switch-example/503828"]configure the second DK to act as the Relay node.[/quote]

will it automatically act as relay node or should i need to add any configurations?

in prj.conf

CONFIG_BT_MESH_RELAY=y it is given like this. is this only enough or should i need to do any other configuration other than this .

Also i have doubt on friend node does the friend node needs a relay node to communicate or it can communicate directly in mesh.? if the mesh network only contains lpn nodes so the message will be relayed through friend node without the use of relay node.

what is the use of proxy and gatt bearer.?

RE: How many device can be connected in mesh light switch example.

Amanda Hsieh — Wed, 25 Sep 2024 17:44:31 GMT

Hi,

[quote user="cyriactoms"]Since i have to send data to the third dk the message with pass through the first and second dk. So which dk will act as the Relay node in it ?[/quote]

The Relay node is responsible for receiving and forwarding messages to extend the range of the network.

If you have three DKs and want to send a message from the first to the third, you could configure the second DK to act as the Relay node. In this setup, when the first DK sends a message, the second DK (as the Relay node) receives and forwards the message to the third DK.

[quote user="cyriactoms"]

For LPN

in the mesh circuit the friend node will be always connected to relay node and the LP node will be connected to friend node is it correct?

so if i am implementing LPN one dk will be relay node one will be freind node and the last will be LPN.

[/quote]

LPNs primarily interact with the mesh network through a Friend node, which is responsible for relaying any messages directed to the LPN. The LPN saves power by keeping its radio turned off, and only wakes up to either send messages or poll the Friend node for the incoming messages.

However, a Relay node can be beneficial in a mesh network as it extends the network range and allows messages to hop between multiple relay nodes, potentially improving the reliability and reach of the network.

A Proxy node can enable communication between a Bluetooth Mesh network and devices that use the Bluetooth Low Energy GATT protocol, such as smartphones. If your application requires this functionality, it needs a Proxy node in your network.

So, the necessary nodes for an LPN in a Bluetooth Mesh network are primarily a Friend node, and optionally a Relay node or a Proxy node, depending on the specific requirements of your application.

See Bluetooth Mesh network topology and concepts

-Amanda H.

RE: How many device can be connected in mesh light switch example.

cyriactoms — Wed, 25 Sep 2024 06:53:45 GMT

Hi,

Thanks for the valuable answer.

Since i have to send data to the third dk the message with pass through the first and second dk. So which dk will act as the Relay node in it ?.

For LPN

in the mesh circuit the friend node will be always connected to relay node and the LP node will be connected to friend node is it correct?

so if i am implementing LPN one dk will be relay node one will be freind node and the last will be LPN.

RE: How many device can be connected in mesh light switch example.

Amanda Hsieh — Mon, 23 Sep 2024 13:57:55 GMT

Hi,

To control multiple nodes, you need to pair each node with the Bluetooth Mesh: Light switch sample running in the same mesh network. Each node in the network will be a server running the Bluetooth Mesh: Light sample.

The communication range in a mesh network is not limited to the Bluetooth connectivity radius. In a mesh network, data is relayed from one node to another. So, even if the light switch node is out of the Bluetooth range from a light node, it can still control the light node as long as there is at least one node within the Bluetooth range that can relay the data.

In those two samples, if you have three light nodes placed 10m apart from each other and a light switch node 30m away from the third light node, the light switch node can still control the third light node. When the light switch node sends a command, the command is relayed through the first and second light nodes to reach the third light node.

Here are the steps:

Flash the Light switch sample to one development kit and the Light sample to the other development kits.
Use the nRF Mesh mobile app to provision each node. During provisioning, an address range is assigned to each device and it is added to the mesh network.
Configure the Generic OnOff Client model on the light switch node and the Generic OnOff Server model on each light node using the nRF Mesh mobile app.
Once the provisioning and configuration are complete, you can control the LEDs on the light nodes using the buttons on the light switch node.

For more detailed instructions, please refer to Light Switch Sample Testing and Light Sample Testing.

Regards,
Amanda H.