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BLE mesh network and localization

Hi support Team,

                            Following are my Questions.

1. Please recommend me  three development boards from Nordic. I would like to build the mesh Network.For example  one will transmit adverstising data act as a source, the second one will relay (retransmit) the Advertising packet and third development board  by receving the data, will be the Destination. Particularly asking this so i can start from example Code instantly.

2. I know that theoratically and somehow AoA and AoD feature(CTE and IQ  data samples) do exist in nRF52833 but still it Needs antenna Array and SDK to use this in direction finding, which i think it is not mature enough. Other than this I know from literature that RSSI, tirangulation, TOA or TOF do exist for localization solution. In 5.1 BLE devcies from Nrdic is there any Enchancement in RSSI  so one can use it for distance measurement? 

3. Regarding mesh Network please recommend me development boards and SDK example links so that i can build the BLE mesh Network  and further modify it by using RSSI to find the distance between two nodes. 

Thanks Support Team

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