Example for setting up BLE long range mesh network between several nodes

[Rostokus]

I am starting building industrial-grade system which contains several nodes connected via wireless channel.

As a wireless protocol I decided to use BLE 5 due to long ranges ( I need nearly 100m indoor) and a good security.

Can I use NRF52840 to setup wireless network between 8 nodes where each node can send messages to all sibling nodes?

Are there some examples already in SDK?

[David Edwin]

You can switch the RF PHY being used in the nRF Mesh SDK from 1Mbit PHY to the coded PHY used in long range.
This will give you the range some usecases seem to prefer.

You can look at this older case to enable the Mesh with coded PHY for longer range.