bmc: implement Get Device GUID

Signed-off-by: Emilio Perez <emiliopeju@gmail.com>

pyipmi/bmc.py

@@ -24,6 +24,9 @@ class Bmc(object):
     def get_device_id(self):
         return DeviceId(self.send_message_with_name('GetDeviceId'))
 
+    def get_device_guid(self):
+        return DeviceGuid(self.send_message_with_name('GetDeviceGuid'))
+
     def cold_reset(self):
         self.send_message_with_name('ColdReset')
 
@@ -165,3 +168,12 @@ def _from_response(self, rsp):
         self.aux = None
         if rsp.auxiliary is not None:
             self.aux = list(rsp.auxiliary)
+
+
+class DeviceGuid(State):
+    def __str__(self):
+        return 'Device GUID: %02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-' \
+           '%02x%02x%02x%02x%02x%02x' % tuple(reversed(self.device_guid))
+
+    def _from_response(self, rsp):
+        self.device_guid = rsp.device_guid

pyipmi/msgs/bmc.py

@@ -174,17 +174,20 @@ class GetAcpiPowerStateRsp(Message):
 
 
 @register_message_class
-class GetDeviceGuideReq(Message):
+class GetDeviceGuidReq(Message):
     __cmdid__ = constants.CMDID_GET_DEVICE_GUID
     __netfn__ = constants.NETFN_APP
-    __not_implemented__ = True
 
 
 @register_message_class
-class GetDeviceGuideRsp(Message):
+class GetDeviceGuidRsp(Message):
     __cmdid__ = constants.CMDID_GET_DEVICE_GUID
     __netfn__ = constants.NETFN_APP | 1
     __not_implemented__ = True
+    __fields__ = (
+        CompletionCode(),
+        ByteArray('device_guid', 16),
+    )
 
 
 @register_message_class