messageType property
type and subtype contains meta information to decode the bytes contained above. See this list of common mime types https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
Implementation
@$pb.TagNumber(3)
$core.String get messageType => $_getSZ(2);
Implementation
@$pb.TagNumber(3)
set messageType($core.String v) { $_setString(2, v); }