/** Unlock the communication channel */
 public int sbUnlockCommunication() {
   return channel.unlock();
 }
 /** Close the communication channel and release any resource if needed */
 public int sbCloseCommunication() {
   return channel.close();
 }
 /**
  * Lock the communication channel to prevent concurrent access from different threads. Currently,
  * this will only work on POSIX systems.
  */
 public int sbLockCommunication() {
   return channel.lock();
 }
 /** Flush the communication channel */
 public int sbFlushCommunication() {
   return channel.flush();
 }