Submicrosecond timing on ESP32 with passive BLE
Capturing the right event, tracking clock drift and checking predictions brought passive BLE timing into the tens of nanoseconds on a measured ESP32-S3 path.
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Engineering notes on shared time, inexpensive hardware and the experiments behind the protocol.
UTC precision instrument
Mesh epoch reporting
GNSS and PTP diagnostics
Why PToB is standardizing on UTC
The decision to end leap seconds lets us keep UTC simple for small clients while retaining a clear path to TAI and PTP environments.
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From spare radio boards to a precision time mesh.
PToB began with unused mesh-radio boards. The goal is now an open, verifiable time mesh across inexpensive hardware and, eventually, multiple timing networks.
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