Root cause: transmit() wraps startTransmit()+finishTransmit(). RadioLib's
finishTransmit() has a timeout of (1/bitRate)*128 = 0.512ms at 250kbps,
which truncates to 0ms, causing immediate RADIOLIB_ERR_TX_TIMEOUT. The
CC1101 was transmitting its 2.59ms packet correctly, but the 10ms inter-
packet guard meant 7.41ms of dead air — only 26% duty cycle. A rolling-
code fob sends 3 attempts in 200ms; with 26% jamming there is a 40%
chance all 3 get through.
Fix: switch to startTransmit() (non-blocking) and reduce guard to 3ms
(JAM_SPECIAL_DELAY_MS / JAM_FLOOD_DELAY_MS). CC1101 finishes the 2.59ms
packet autonomously and returns to IDLE. startTransmit() restarts cleanly
every ~3ms without ever cutting a packet short. Duty cycle: ~85%.
Made-with: Cursor
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