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Implement CAD check for LBT & Serial KISS TNC devices (MeshTNC).
This PR bumps the version to 1.0.4 and refactors the LoRa transmission timeout calculation and channel busy backoff logic in the SX1262 radio driver. The changes align the Python implementation with a C++ MeshCore formula for more accurate timing calculations. - Version updated from 1.0.3 to 1.0.4 across all relevant files - Replaced approximate timeout calculation with precise LoRa airtime formula - Improved channel busy backoff with exponential backoff strategy
Anonymous authentication + LBT feedback metrics
Refactor type hints to use Optional for python 3.9
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Without this fix, both rx_en and tx_en pins will be driven low when they are initialized as outputs.
This means the RF switch is in TX mode, while rx_en needs to be high to be in RX mode.
The situation resolves itself after the first time the radio sends something, however until then the RF switch sits in TX mode, while it should be RX.