What is the minimum and maximum amount of data(bytes) that can be sent within mesh bluetooth network?

[Farhanah Ruslan]

Hi,

I am working on mesh bluetooth using nrf52832 with PCA10040 ,  I used example from   nrf5_SDK_for_Mesh_v2.0.1_src , my questions are

1.How many bytes(Max and min) can be sent between the server and client? for this case I set up as in this link . 

2. I used serial example and tried to send  command with Terminal software  and look at the output(hex and bin) at the Terminal .  Is the right way to check the data size sent?

Lastly, Is there any way we can send data  from our phone to the mesh network , Is there any app or program that I can use? And what will be the size of data(max and min) that can be sent from the phone to the mesh network?

[Susheel Nuguru]

Hi,

 

1)Since Bluetooth Mesh (BTMesh) is built on BLE 4.0.

BTMesh works only on advertising barrier, meaning, that it makes use of only advertising packets to transfer data.

And the Min and Max payload (data) in advertising packet are 6 and 37 bytes, Also the snapshot from spec BLE v4.0 Vol6->PartB->2.3.1

.2) On the terminal yes, you can use commands or use RTT to print from your application.

Currently the nRF Mesh APP is a very good starting point that can be used to configure the Mesh network, but it cannot be used to send and sniff data. I am not sure if there are any other generic apps you can use for this.

[Vishnu]

Hi  Susheel Nuguru,

I am able to send 255 bytes and receive all bytes without loss from one node to another in one shot. I have not modified anything related to segmentation. I am using mesh sdk version 3 and nrf52840 dev boards. Does the softdevice automatically segment packets? 

[Edvin]

Yes. It is segmented by the SDK. It isn't the softdevice that does this, but the libraries in the SDK.