code: public Observable<ComapiResult<MessageSentResponse>> sendMessage(@NonNull final String conversationId, @NonNull final String body) {
          SessionData session = dataMgr.getSessionDAO().session();
          return sendMessage(conversationId, APIHelper.createMessage(conversationId, body, session != null ? session.getProfileId() : null));
      }
docs: Send message to the chanel.
  
  @param conversationId ID of a conversation to send a message to.
  @param body           Message body to be send.
  @return Observable to send message to a conversation.