public async Task SendGroupMessage(LivechatMessagePack messagePack)
{
if (messagePack.FromConnectionId == null)
{
messagePack.FromConnectionId = hubContext.ConnectionId;
}
if (messagePack.IsPersistent)
{
await messageLogger.CreateLog(messagePack);
}
await clientsManager
.Group(messagePack.ChannelId)
.SendAsync(HubMessages.SEND, messagePack);
}