exo_sw_dissectors/Dissector/tm_get_sband_version.lua

function tm_get_sband_version(buffer, pinfo, tree, sband_version, offset)
    -- Define ProtoFields
    local f_file_cnt = ProtoField.uint8("sband_version.file_cnt", "File Count", base.DEC)
    local f_file_name_cnt = ProtoField.uint8("sband_version.file_name_cnt", "File Name Count", base.DEC)
    local f_seconds = ProtoField.uint8("sband_version.seconds", "Seconds", base.DEC)
    local f_minutes = ProtoField.uint8("sband_version.minutes", "Minutes", base.DEC)
    local f_hours = ProtoField.uint8("sband_version.hours", "Hours", base.DEC)
    local f_year = ProtoField.uint16("sband_version.year", "Year", base.DEC)
    local f_months = ProtoField.uint8("sband_version.months", "Months", base.DEC)
    local f_day = ProtoField.uint8("sband_version.day", "Day", base.DEC)
    local f_file_name = ProtoField.bytes("sband_version.file_name", "File Name")
    local f_start_adr = ProtoField.uint32("sband_version.start_adr", "Start Address", base.HEX)
    local f_len = ProtoField.uint32("sband_version.len", "Length", base.DEC)
    local f_flags = ProtoField.uint8("sband_version.flags", "Flags", base.HEX)

    -- Register the fields in the protocol
    sband_version.fields = {
        f_file_cnt, f_file_name_cnt,
        f_seconds, f_minutes, f_hours, f_year, f_months, f_day,
        f_file_name, f_start_adr, f_len, f_flags
    }

    -- Create the subtree for `version_date_struct`
    local subtree = tree:add(sband_version, buffer(), "TM GET SBAND VERSION")

    -- Parse `file_cnt`
    local cnt = buffer(offset, 1):le_uint()
    subtree:add(f_file_cnt, buffer(offset, 1))
    offset = offset + 1

    -- Parse `file_name_cnt`
    --subtree:add(f_file_name_cnt, buffer(offset, 1))
    --offset = offset + 1

    -- Parse `VERSION_DATE_STRUCT`
    for i = 0 , cnt - 1 do
    local version_subtree = subtree:add(buffer(offset), "VERSION_DATE_STRUCT")

    -- Parse the packed date/time fields (32 bits)
    local date_time_value = buffer(offset, 4):le_uint()
    version_subtree:add(f_seconds, (date_time_value & 0x3F)) -- 6 bits
    version_subtree:add(f_minutes, ((date_time_value >> 6) & 0x3F)) -- 6 bits
    version_subtree:add(f_hours, ((date_time_value >> 12) & 0x1F)) -- 5 bits
    version_subtree:add(f_year, ((date_time_value >> 17) & 0x3F)) -- 6 bits
    version_subtree:add(f_months, ((date_time_value >> 23) & 0x0F)) -- 4 bits
    version_subtree:add(f_day, ((date_time_value >> 27) & 0x1F)) -- 5 bits
    offset = offset + 4

    -- Parse `FileName` (4 bytes)
    version_subtree:add(f_file_name, buffer(offset, 4))
    offset = offset + 4

    -- Parse `start_adr` (32 bits)
    version_subtree:add_le(f_start_adr, buffer(offset, 4))
    offset = offset + 4

    -- Parse the packed `len` and `Flags` fields (32 bits)
    local len_flags_value = buffer(offset, 4):le_uint()
    version_subtree:add(f_len, (len_flags_value & 0x0FFFFFFF)) -- 28 bits
    version_subtree:add(f_flags, ((len_flags_value >> 28) & 0x0F)) -- 4 bits
    offset = offset + 4
    end

end