updateMessage method
Implementation
Future<rtpb.ChannelMessageAck> updateMessage({
required String channelId,
required String messageId,
required Map<String, String> content,
}) =>
_send<rtpb.ChannelMessageAck>(rtpb.Envelope(
channelMessageUpdate: rtpb.ChannelMessageUpdate(
channelId: channelId,
messageId: messageId,
content: jsonEncode(content),
)));