环信透传消息，无法回调

 [[EMClient sharedClient].chatManager
                          
                          sendMessageReadAck:msg completion:^(EMMessage *aMessage, EMError *aError) {
                             BSLog(@"----%@---%@---", aMessage, aError);
                         }];
                         
                         [[EMClient sharedClient].chatManager sendMessage:msg progress:^(int progress) {
                             
                         } completion:^(EMMessage *message, EMError *error) {
                             BSLog(@"----%@---%@---", message, aError);

                         }];
                         
                         [[EMClient sharedClient].chatManager resendMessage:msg progress:^(int progress) {
                             
                         } completion:^(EMMessage *message, EMError *error) {
                             BSLog(@"----%@---%@---", message, aError);
                         }];