Constant MAC_REPEATER_ENABLED 

pub const MAC_REPEATER_ENABLED: u32 = 70;

Autonomous MAC-layer repeater/forwarding enable (PROP_MAC_REPEATER_ENABLED).

First of the device-behavior settings range (70–95), which is subdivided as 70–79 repeater and identity, 80–87 advertisement policy (80–82 allocated, 83–87 spare), 88–93 positioning, 94–95 environmental sensing (94 illuminance, 95 spare — the board’s thermistor is the expected claimant). A single-octet identifier is the scarce resource, so the positioning range holds the enable toggle and the fix telemetry a host reads and the device announces continually; the rarely-touched positioning configuration lives in the extended device range alongside PROP_TIME. A persisted, device-domain boolean: when set, the device identity’s on-board MAC forwards overheard routable frames and advertises the REP capability bit. The advertised role is a separate matter — see IDENT_ROLE.