TimeSignalMessage  
    class TimeSignalMessage
The SCTE-35 time_signal message can be sent with one or more segmentation_descriptor messages. A time_signal message can be sent only if a single segmentation_descriptor message is sent.
The time_signal message contains only the splice_time field which is constructed using a given presentation timestamp. When sending a time_signal message, the splice_command_type field in the splice_info_section message is set to 6 (0x06).
See the time_signal() table of the 2022 SCTE-35 specification for more information.