diff --git a/app/src/gen3plus/solarman_v5.py b/app/src/gen3plus/solarman_v5.py
index 3e4715d..72b2172 100644
--- a/app/src/gen3plus/solarman_v5.py
+++ b/app/src/gen3plus/solarman_v5.py
@@ -55,8 +55,8 @@ class SolarmanV5(Message):
 
             #
             # AT cmd
-            0x4510: self.msg_unknown,    # from server
-            0x1510: self.msg_forward,    # from inverter
+            0x4510: self.at_command_ind,  # from server
+            0x1510: self.msg_forward,     # from inverter
         }
 
     '''
@@ -329,3 +329,7 @@ class SolarmanV5(Message):
         dt = datetime.fromtimestamp(ts)
         logger.info(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')
         self.forward(self._recv_buffer, self.header_len+self.data_len+2)
+
+    def at_command_ind(self):
+        self.inc_counter('AT_Command')
+        self.msg_forward()
diff --git a/app/src/infos.py b/app/src/infos.py
index d4be504..2f85c1e 100644
--- a/app/src/infos.py
+++ b/app/src/infos.py
@@ -26,6 +26,7 @@ class Register(Enum):
     OTA_START_MSG = 56
     SW_EXCEPTION = 57
     INVALID_MSG_FMT = 58
+    AT_COMMAND = 59
     OUTPUT_POWER = 83
     RATED_POWER = 84
     INVERTER_TEMP = 85
@@ -154,6 +155,7 @@ class Infos:
         Register.OTA_START_MSG:     {'name': ['proxy', 'OTA_Start_Msg'],      'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'ota_start_cmd_', 'fmt': '| int', 'name': 'OTA Start Cmd',        'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
         Register.SW_EXCEPTION:      {'name': ['proxy', 'SW_Exception'],       'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'sw_exception_',  'fmt': '| int', 'name': 'Internal SW Exception', 'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
         Register.INVALID_MSG_FMT:   {'name': ['proxy', 'Invalid_Msg_Format'], 'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_msg_fmt_',   'fmt': '| int', 'name': 'Invalid Message Format', 'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.AT_COMMAND:        {'name': ['proxy', 'AT_Command'],         'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'at_cmd_',        'fmt': '| int', 'name': 'AT Command',           'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
         # 0xffffff03:  {'name':['proxy', 'Voltage'],                        'level': logging.DEBUG, 'unit': 'V',    'ha':{'dev':'proxy', 'dev_cla': 'voltage',     'stat_cla': 'measurement', 'id':'proxy_volt_',  'fmt':'| float','name': 'Grid Voltage'}},  # noqa: E501
 
         # events
diff --git a/app/tests/test_infos.py b/app/tests/test_infos.py
index e3750ff..f833e0e 100644
--- a/app/tests/test_infos.py
+++ b/app/tests/test_infos.py
@@ -410,13 +410,13 @@ def test_statistic_counter():
     assert val == None or val == 0
 
     i.static_init()                # initialize counter
-    assert json.dumps(i.stat) == json.dumps({"proxy": {"Inverter_Cnt": 0, "Unknown_SNR": 0, "Unknown_Msg": 0, "Invalid_Data_Type": 0, "Internal_Error": 0,"Unknown_Ctrl": 0, "OTA_Start_Msg": 0, "SW_Exception": 0, "Invalid_Msg_Format": 0}})
+    assert json.dumps(i.stat) == json.dumps({"proxy": {"Inverter_Cnt": 0, "Unknown_SNR": 0, "Unknown_Msg": 0, "Invalid_Data_Type": 0, "Internal_Error": 0,"Unknown_Ctrl": 0, "OTA_Start_Msg": 0, "SW_Exception": 0, "Invalid_Msg_Format": 0, "AT_Command": 0}})
                                             
     val = i.dev_value(Register.INVERTER_CNT)  # valid and initiliazed addr
     assert val == 0
 
     i.inc_counter('Inverter_Cnt')
-    assert json.dumps(i.stat) == json.dumps({"proxy": {"Inverter_Cnt": 1, "Unknown_SNR": 0, "Unknown_Msg": 0, "Invalid_Data_Type": 0, "Internal_Error": 0,"Unknown_Ctrl": 0, "OTA_Start_Msg": 0, "SW_Exception": 0, "Invalid_Msg_Format": 0}})
+    assert json.dumps(i.stat) == json.dumps({"proxy": {"Inverter_Cnt": 1, "Unknown_SNR": 0, "Unknown_Msg": 0, "Invalid_Data_Type": 0, "Internal_Error": 0,"Unknown_Ctrl": 0, "OTA_Start_Msg": 0, "SW_Exception": 0, "Invalid_Msg_Format": 0, "AT_Command": 0}})
     val = i.dev_value(Register.INVERTER_CNT)
     assert val == 1
 
diff --git a/app/tests/test_solarman.py b/app/tests/test_solarman.py
index 7cd11a7..52de01c 100644
--- a/app/tests/test_solarman.py
+++ b/app/tests/test_solarman.py
@@ -17,6 +17,7 @@ class MemoryStream(SolarmanV5):
         self.msg_count = 0
         self.addr = 'Test: SrvSide'
         self.db.stat['proxy']['Invalid_Msg_Format'] = 0
+        self.db.stat['proxy']['AT_Command'] = 0
 
 
     def append_msg(self, msg):
@@ -220,6 +221,14 @@ def HeartbeatRspMsg():  # 0x1710
     msg += b'\x15'
     return msg
 
+@pytest.fixture
+def AtCommandIndMsg():  # 0x4510
+    msg  = b'\xa5\x01\x00\x10\x45\x10\x84' +get_sn()
+    msg += b'\x00'               
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
 @pytest.fixture
 def ConfigTsunAllowAll():
     Config.config = {'solarman':{'enabled': True}, 'inverters':{'allow_all':True}}
@@ -589,3 +598,22 @@ def test_heartbeat_rsp(ConfigTsunInv1, HeartbeatRspMsg):
     assert m._forward_buffer==HeartbeatRspMsg
     assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
     m.close()
+
+def test_at_command_ind(ConfigTsunInv1, AtCommandIndMsg):
+    ConfigTsunInv1
+    m = MemoryStream(AtCommandIndMsg, (0,))
+    m.read()         # read complete msg, and dispatch msg
+    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert m.msg_count == 1
+    assert m.header_len==11
+    assert m.snr == 2070233889
+    # assert m.unique_id == '2070233889'
+    assert m.control == 0x4510
+    assert m.serial == 0x8410
+    assert m.data_len == 0x01
+    assert m._recv_buffer==b''
+    assert m._send_buffer==b''
+    assert m._forward_buffer==AtCommandIndMsg
+    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
+    assert m.db.stat['proxy']['AT_Command'] == 1
+    m.close()