PToB applies PTP principles to public BLE time broadcasts. Documented T096 configurations measured 70.197 and 76.359 ns uncentered PPS-shadow RMS; ESP32-S3 measured 319.5 ns internal published-prediction RMS in a normal 600-second run.
Published here on . Jonathan Yantis leads protocol design, hardware development, and research; GPT 6.1 contributes implementation, analysis, and documentation.
These are separate tested configurations. Values remain in nanoseconds and use the statistic reported in the paper.
PPS-shadow query of the already-published BLE clock at a separately captured reference edge on the same local hardware counter. Common 10,516 ns edge correction trained separately and frozen before validation; no receiver-GPS training, validation refit, centering, or outlier deletion.
PPS-shadow query of the already-published BLE clock at a separately captured reference edge on the same local hardware counter. The same separately trained, frozen 10,516 ns edge correction; one unscoreable causal query retained in the denominator.
Internal causal prediction evaluated at physical target events using the previously published clock model. Controller-to-timer mapping.
Fine / coarse / unavailable clock views: 1,123 / 18 / 57 of 1,198 sampled views. Accuracy at scored events does not establish continuous clock availability.
A PPS-shadow query evaluates the already-published BLE clock at a separately captured pulse-per-second reference edge, on the same local hardware counter. The reference validates the BLE clock and does not train it. The reported T096 RMS includes bias; the validation data were not centered or refitted.
The ESP32-S3 result measures internal published predictions at physical target events. It uses a different timing path and measurement reference from the T096 result.
PToB proposes receive-only time acquisition, capability-dependent refinement, authorized grandmaster elections, and bounded mesh forwarding. It is not an adopted Bluetooth SIG or IEEE standard. Medical validation, broadcast genlock, holdover, and power qualification require separate evidence.
The public proposal describes service profiles and the wire contract. The research preprint documents the calibration and measurements summarized here.
Compare the reported methods