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Choosing the correct BLE Technolog

Hi, 

I'd like the create the following device layout , all nRF52840 :

Device #1 ------> Device #2 -------> Device #3 --------> Device #4 ---------> Gateway----> "Cloud"

A Device needs to report information to the Gateway , the distance from far devices to the gateway maybe too large for direct connection. 

There can be 10's of devices. all reporting to the same gateway ( every 15. minutes ).

Gateway is also nRF52840 with a modem connected over UART. 

Adding a new device, should be a simple process, preferably from a mobile phone. 

I'd seeking for an advice on the best nrf technology to use (mesh? aggregation ? relay ? ) and would appreciate your advice.  

This is for a remote metering reading from tall buildings. 

Thanks, 

Ran

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