The manuals for the nRF51 and nRF52 list the maximum ESB radio channel number as 100, but in the SDK the guard value in the set channel function is <= 125
(in both the older SDK's using micro_esb.c, and the latest SDK 12.0.0 using nrf_esb.c).
Whch value is correct?
See: SDK 12.0.0 using nrf_esb.c, line 1242 micro_esb.c, line 573 nRF51 Series Reference Manual (page 93) nRF52832 - Product Specification v1.0 (page 216)