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nrf52 mesh max node question

In our mesh application, we are trying to give all our devices the same network key. As we are planning to have in excess of 100,000 devices, the 2-byte unicast address is insufficient. I have been examining the mesh SDK to determine the feasibility of increasing the unicast address to a 4-byte number. Syntactically, I can search all the source files in the SDK, replacing all 16-bit address variables with 32-bit variables, and I have determined that I will have to do this manually, as there is no common text that I can search to reveal all places that use addresses. However, I would like some expert opinions as to the side effects of this maneuver. Is it as "easy" as I make it out to be, or are there more complicated concerns with doing this (including anything from encryption to interference with normal mesh devices to regulatory concerns)?

Thanks Bryan

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