Function get_program_guide 

pub async fn get_program_guide(
    conn: &Connection,
    endpoint: u16,
    start_time: u64,
    end_time: u64,
    channel_list: Option<Vec<ChannelInfo>>,
    page_token: Option<PageToken>,
    recording_flag: Option<RecordingFlag>,
    data: Option<Vec<u8>>,
) -> Result<ProgramGuideResponse>

Invoke GetProgramGuide command on cluster Channel.