Jca: /* Install as a service on the client */

2026-04-20T12:30:57Z

Install as a service on the client

← Older revision		Revision as of 14:30, 20 April 2026
Line 119:		Line 119:
	Also, enable and start this service:		Also, enable and start this service:

	sudo systemctl daemon-reload		sudo systemctl daemon-reload
	sudo systemctl enable ptp4l-client.service		sudo systemctl enable ptp4l-client.service
	sudo systemctl start ptp4l-client.service		sudo systemctl start ptp4l-client.service

	Check the status of the client when all is in place		Check the status of the client when all is in place
	sudo systemctl status ptp4l-client		sudo systemctl status ptp4l-client

Jca: /* Test time master */

2026-04-20T12:29:08Z

Test time master

← Older revision		Revision as of 14:29, 20 April 2026
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	Start clock master service on eth0		Start clock master service on eth0

	sudo ptp4l -i eth0 -m -2 -s		sudo ptp4l -i eth0 -m -2

	It should be activated as a grand master soon.		It should be activated as a grand master soon.

Jca: /* Test time client */

2026-04-20T12:28:36Z

Test time client

← Older revision		Revision as of 14:28, 20 April 2026
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	Run a PTP test slave (-s) with output to console (-m).		Run a PTP test slave (-s) with output to console (-m).

	sudo ptp4l -i eth0 -m -2 -s		sudo ptp4l -i eth0 -m -2 -s

	After a few minutes, this should yield a time offset on the order of 100 ns.		After a few minutes, this should yield a time offset on the order of 100 ns.

Jca: Created page with "Back to Ricbot == PTP == Precise Time Protocol (on Raspberry Pi 5) Assuming 2 Raspberry Pis are connected with an Ethernet cable, and both have an IP on eth0. === Install === Install on both master and slave: sudo apt install linuxptp Verify that there is support on 'eth0'. Should have hardware capabilities: $ ethtool -T eth0 Time stamping parameters for eth0: Capabilities: hardware-transmit software-transmit hardware-receive..."

2026-04-20T12:27:32Z

Created page with "Back to Ricbot == PTP == Precise Time Protocol (on Raspberry Pi 5) Assuming 2 Raspberry Pis are connected with an Ethernet cable, and both have an IP on eth0. === Install === Install on both master and slave: sudo apt install linuxptp Verify that there is support on 'eth0'. Should have hardware capabilities: $ ethtool -T eth0 Time stamping parameters for eth0: Capabilities: hardware-transmit software-transmit hardware-receive..."

New page

Back to [[Ricbot]]

== PTP ==

Precise Time Protocol (on Raspberry Pi 5)

Assuming 2 Raspberry Pis are connected with an Ethernet cable, and both have an IP on eth0.

=== Install ===

Install on both master and slave:
sudo apt install linuxptp

Verify that there is support on 'eth0'.
Should have hardware capabilities:

$ ethtool -T eth0
Time stamping parameters for eth0:
Capabilities:
hardware-transmit
software-transmit
hardware-receive
software-receive
software-system-clock
hardware-raw-clock

=== Test time master ===

Start connection to eth0 hardware (as a process in the background)

sudo phc2sys -s CLOCK_REALTIME -c eth0 -w &

Start clock master service on eth0

sudo ptp4l -i eth0 -m -2 -s

It should be activated as a grand master soon.

=== Test time client ===

Run a PTP test slave (-s) with output to console (-m).

sudo ptp4l -i eth0 -m -2 -s

After a few minutes, this should yield a time offset on the order of 100 ns.

Kill the phc2sys on the time server after the client test:
sudo pkill phc2sys

=== Install as a service on Master ===

Most is copied from https://austinsnerdythings.com/2025/02/18/nanosecond-accurate-ptp-server-grandmaster-and-client-tutorial-for-raspberry-pi/.

Create a service file for the connection to eth0:

sudo nano /etc/systemd/system/phc2sys-grandmaster.service

With:
[Unit]
Description=sync PHC with system clock (grandmaster)
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/usr/sbin/phc2sys -s CLOCK_REALTIME -c eth0 -w
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target

Create a service file for the ptp server:

sudo nano /etc/systemd/system/ptp4l-grandmaster.service

With:
[Unit]
Description=Precision Time Protocol (PTP) service (Grandmaster)
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/usr/sbin/ptp4l -i eth0 -2
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target

Enable and start these services

sudo systemctl daemon-reload
sudo systemctl enable phc2sys-grandmaster.service
sudo systemctl enable ptp4l-grandmaster.service
sudo systemctl start phc2sys-grandmaster.service
sudo systemctl start ptp4l-grandmaster.service

=== Install as a service on the client ===

Make a new service file
sudo nano /etc/systemd/system/ptp4l-client.service
With:
[Unit]
Description=Precision Time Protocol (PTP) service (Client)
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/usr/sbin/ptp4l -i eth0 -2 -m --summary_interval 3
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target

Also, enable and start this service:

sudo systemctl daemon-reload
sudo systemctl enable ptp4l-client.service
sudo systemctl start ptp4l-client.service

Check the status of the client when all is in place
sudo systemctl status ptp4l-client

Ricbot PTP - Revision history

Jca: /* Install as a service on the client */

Jca: /* Test time master */

Jca: /* Test time client */