Successor to NRF51822-Beacon

We developed a social metering application for a study using the NRF51822-beacon reference design.

Due to obsolesence we are currently evaluating if an upgrade to a newer nrf5x is feasible.

However we did not find a open finalized reference design like the nrf51822-beacon that is fully programmable. Is there one available or what would be closest?

Thank you very much

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