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Update the reachability register of a refclock source by 1 if a valid measurement is received by the drivers between source polls, and not only when it is accumulated to sourcestats, similarly to how reachability works with NTP sources. This avoids drops in the reported reachability when a PHC refclock is dropping samples due to significant changes in the measured delay (e.g. due to high PCIe load), or a PPS refclock dropping samples due to failed lock.
This is a collection of simulation tests using the clknetsim simulator (supported on Linux only). https://github.com/mlichvar/clknetsim The CLKNETSIM_PATH environment variable should point to the directory where clknetsim was downloaded and compiled. If the variable is not set, the tests will look for clknetsim in ./clknetsim in the current directory. The tests are written in bash and they can be run directly. The ./run script runs all tests.