Hot Start

Benchmark cold start vs hot start acquisition times.

Source: examples/CPP/HotStart/, examples/C/HotStart/, examples/Python/hot_start.py

What It Does

Cold start — hardResetUbloxSom_ColdStart() clears all satellite data, measures time to first fix
Hot start — softResetUbloxSom_HotStart() preserves satellite data, measures time to first fix

Expected Results

Reset Type	Typical TTFF	Description
Cold start	30–60 seconds	No satellite data — receiver must search and acquire
Hot start	1–3 seconds	Preserved ephemeris/almanac enables rapid reacquisition

Note

Hot start is much faster because the receiver already knows which satellites are visible. Always use softResetUbloxSom_HotStart() unless you specifically need to clear stored data.

Running

python3 examples/Python/hot_start.py