The source for system time. The time source can be configured to come from an SNTP time source, or be generated internally. When configured as internal: - The APEX will internally keep time starting at GPS time 0. A user can set the time to a valid GPS time in this mode. - The system time and UTC offset in internal mode are not updated and therefore are not valid. When configured to receive time via SNTP the SntpServerSpecified object and SntpServiceIP objects can be used to optionally define the SNTP server. Once written, the change to this parameter will take immediate effect. However, in order for the change to persist through subsequent reboots or power cycles, the change must be saved via the apexSaveConfig parameter. @Config(config=yes, reboot=no) @Save(apexSaveConfig, value=2) @File(config.ini, type='ini')