Implemented the dyn2_get_read_status_id function of the dynamixel master interface.

dynamixel_base/src/dynamixel2.c

@@ -484,3 +484,8 @@ unsigned short int dyn2_get_read_status_data(unsigned char *packet,unsigned char
 
   return length;
 }
+
+inline unsigned char dyn2_get_read_status_id(unsigned char *packet)
+{
+  return packet[DYN2_ID_OFF];
+}

dynamixel_base/src/dynamixel_slave.c

@@ -113,22 +113,22 @@ void dummy_dyn_slave_on_ping(void)
 
 unsigned char dummy_dyn_slave_on_read(unsigned short int address,unsigned short int length,unsigned char *data)
 {
-  return 0x00;
+  return DYN_SUCCESS;
 }
 
 unsigned char dummy_dyn_slave_on_write(unsigned short int address,unsigned short int length,unsigned char *data)
 {
-  return 0x00;
+  return DYN_SUCCESS;
 }
 
 unsigned char dummy_dyn_slave_on_reset(void)
 {
-  return 0x00;
+  return DYN_SUCCESS;
 }
 
 unsigned char dummy_dyn_slave_on_relay(TDynVersion version,unsigned char *inst_pkt,unsigned char *status_pkt)
 {
-  return 0x00;
+  return DYN_NO_DEVICE;
 }