samples: add sat-pass-prediction Zephyr sample#253
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A sample application that uses satellite pass prediction to time transmissions. The main loop computes the next pass above the device location, sleeps until it opens, then broadcasts a packet. An optional shell interface exposes runtime state, and a companion tool fetches orbital parameters from the Hubble ephemeris API. Signed-off-by: Paul Buckley <paul@hubble.com>
| uint64_t now = hubble_time_get() / 1000ULL; | ||
| int64_t wait; | ||
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| err = hubble_sat_next_pass_get(now, &device_pos, &pass); |
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Since we put in the doc that device uptime must never be used for pass prediction, I'm not sure if having this sample is a good idea since we're going against our recommendation.
The issue is that hubble_sat_next_pass_get account for retries for TDR, with device uptime as counter source, the call to hubble_internal_time_drift_get() will returns 0 anyway since time is not synced. So time drift is not accounted for regardless of whatever value CONFIG_HUBBLE_SAT_NETWORK_DEVICE_TDR is set to.
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A sample application that uses satellite pass prediction to time transmissions. The main loop computes the next pass above the device location, sleeps until it opens, then broadcasts a packet.
An optional shell interface exposes runtime state, and a companion tool fetches orbital parameters from the Hubble ephemeris API.