Time Slave User Manual

User Manual Time Slave Component		status: draft security: NO safety: QM
version: 1 realizes: wp__training_path
doc__user_manual_time_slave		Generic Document

Overview

The TimeSlave component is a system daemon responsible for synchronizing with the PTP Grandmaster Clock over the network. It adjusts the hardware clock (PHC) and publishes synchronization data to shared memory for consumption by the TimeDaemon.

For module-level integration and deployment information, see the main module manual.

Configuration

• TimeSlave Configuration
  • Command-Line Arguments
  • Default Configuration (GptpEngineOptions)
  • Example Invocation

Runtime Requirements

Operating System Privileges

The TimeSlave executable (time_slave) requires elevated privileges to access raw network sockets and control the hardware clock. It is strongly recommended not to run this process as the root user. Instead, grant the required Linux Capabilities to the executable:

sudo setcap cap_net_admin,cap_net_raw,cap_sys_time+eip /path/to/time_slave

• cap_net_admin: For network interface configuration.

• cap_net_raw: For the use of raw sockets to listen to PTP traffic.

• cap_sys_time: For adjusting the system’s hardware clock.

Network Requirements

• The network interface used for PTP communication must be provided via the -i, --interface <name> command-line argument.

• The ECU must have network connectivity to the PTP Grandmaster clock on this interface.

• Network hardware must support PHC (PTP Hardware Clock).