code: public void sendMessage(@NonNull final String conversationId, @NonNull final MessageToSend message, @Nullable Callback<ComapiResult<MessageSentResponse>> callback) {
          adapter.adapt(sendMessage(conversationId, message), callback);
      }
docs: Send message to the chanel.
  
  @param conversationId ID of a conversation to send a message to.
  @param message        Message to be send.
  @param callback       Callback to deliver new session instance.