drmem-drv-ntp

This driver monitors the state of an NTP server and updates devices with the latest information. It only reports information when the NTP server has "sync-ed" with another time server.

The NTP server needs to be configured to use UDP communications. Servers using broadcasts or multicasts to stay in sync will not generate any updates from this driver.

It should be noted that, when these devices update, their timestamps are suspect. The author's RPi -- after a reboot -- takes hours before the time is within 1 ms of the remote time server. During that stabilization time, the timestamps hop around by tens of milliseconds. If your system is configured to write to a remote redis server, your timestamps will be more consistent.

Configuration

The driver needs to know the address of the NTP server. The NTP server should be configured to accept query requests on the interface this driver will access.

• addr is a string containing the host name, or IP address, and port number of the machine that's running the NTP service (in "hostname:#" or "#.#.#.#:#" format.) The port is almost always 123.

Devices

The driver creates these devices:

History

Added in v0.1.0.