diff --git a/app/src/gen3/talent.py b/app/src/gen3/talent.py
index 33d5d8d..daf700f 100644
--- a/app/src/gen3/talent.py
+++ b/app/src/gen3/talent.py
@@ -35,6 +35,9 @@ class Control:
 
 
 class Talent(Message):
+    STATE_INIT = 0
+    STATE_UP = 2
+    STATE_CLOSED = 3
 
     def __init__(self, server_side: bool, id_str=b''):
         super().__init__(server_side)
@@ -45,7 +48,7 @@ class Talent(Message):
         self.db = InfosG3()
         self.mb = Modbus()
         self.forward_modbus_resp = False
-        self.closed = False
+        self.state = self.STATE_INIT
         self.switch = {
             0x00: self.msg_contact_info,
             0x13: self.msg_ota_update,
@@ -67,7 +70,7 @@ class Talent(Message):
         # so we have to erase self.switch, otherwise this instance can't be
         # deallocated by the garbage collector ==> we get a memory leak
         self.switch.clear()
-        self.closed = True
+        self.state = self.STATE_CLOSED
 
     def __set_serial_no(self, serial_no: str):
 
@@ -126,6 +129,8 @@ class Talent(Message):
         return
 
     async def send_modbus_cmd(self, func, addr, val) -> None:
+        if self.state != self.STATE_UP:
+            return
         self.forward_modbus_resp = False
         self.__build_header(0x70, 0x77)
         self._send_buffer += b'\x00\x01\xa3\x28'   # fixme
@@ -331,6 +336,7 @@ class Talent(Message):
             self._send_buffer += b'\x01'
             self.__finish_send_msg()
             self.__process_data()
+            self.state = self.STATE_UP
 
         elif self.ctrl.is_resp():
             return  # ignore received response
@@ -359,7 +365,7 @@ class Talent(Message):
         msg_hdr_len = self.parse_msg_header()
 
         for key, update in self.db.parse(self._recv_buffer, self.header_len
-                                         + msg_hdr_len):
+                                         + msg_hdr_len, self.node_id):
             if update:
                 self.new_data[key] = True
 
diff --git a/app/src/gen3plus/solarman_v5.py b/app/src/gen3plus/solarman_v5.py
index b175cb3..823e5ab 100644
--- a/app/src/gen3plus/solarman_v5.py
+++ b/app/src/gen3plus/solarman_v5.py
@@ -302,6 +302,8 @@ class SolarmanV5(Message):
         self.__finish_send_msg()
 
     async def send_modbus_cmd(self, func, addr, val) -> None:
+        if self.closed:
+            return
         self.forward_modbus_resp = False
         self.__build_header(0x4510)
         self._send_buffer += struct.pack('<BHLLL', self.MB_RTU_CMD,
@@ -315,6 +317,8 @@ class SolarmanV5(Message):
             self._send_buffer = bytearray(0)
 
     async def send_at_cmd(self, AT_cmd: str) -> None:
+        if self.closed:
+            return
         self.__build_header(0x4510)
         self._send_buffer += struct.pack(f'<BHLLL{len(AT_cmd)}sc', self.AT_CMD,
                                          2, 0, 0, 0, AT_cmd.encode('utf-8'),
@@ -347,7 +351,8 @@ class SolarmanV5(Message):
     def __process_data(self, ftype):
         inv_update = False
         msg_type = self.control >> 8
-        for key, update in self.db.parse(self._recv_buffer, msg_type, ftype):
+        for key, update in self.db.parse(self._recv_buffer, msg_type, ftype,
+                                         self.node_id):
             if update:
                 if key == 'inverter':
                     inv_update = True
diff --git a/app/src/mqtt.py b/app/src/mqtt.py
index 3469201..484d7df 100644
--- a/app/src/mqtt.py
+++ b/app/src/mqtt.py
@@ -130,7 +130,7 @@ class Mqtt(metaclass=Singleton):
         topic = str(message.topic)
         node_id = topic.split('/')[1] + '/'
         for m in Message:
-            if m.server_side and not m.closed and (m.node_id == node_id):
+            if m.server_side and (m.node_id == node_id):
                 logger_mqtt.debug(f'Found: {node_id}')
                 fnc = getattr(m, func_name, None)
                 if callable(fnc):
@@ -148,7 +148,7 @@ class Mqtt(metaclass=Singleton):
         payload = message.payload.decode("UTF-8")
         logger_mqtt.info(f'InvCnf: {node_id}:{payload}')
         for m in Message:
-            if m.server_side and not m.closed and (m.node_id == node_id):
+            if m.server_side and (m.node_id == node_id):
                 logger_mqtt.info(f'Found: {node_id}')
                 fnc = getattr(m, "send_modbus_cmd", None)
                 res = payload.split(',')
diff --git a/app/tests/test_talent.py b/app/tests/test_talent.py
index a94df4f..202cd96 100644
--- a/app/tests/test_talent.py
+++ b/app/tests/test_talent.py
@@ -733,10 +733,16 @@ def test_msg_unknown(ConfigTsunInv1, MsgUnknown):
     m.close()
 
 def test_ctrl_byte():
+    c = Control(0x70)
+    assert not c.is_ind()
+    assert not c.is_resp()    
+    assert c.is_req()
     c = Control(0x91)
+    assert not c.is_req()
     assert c.is_ind()
     assert not c.is_resp()    
     c = Control(0x99)
+    assert not c.is_req()
     assert not c.is_ind()
     assert c.is_resp()    
 
@@ -891,8 +897,9 @@ def test_msg_modbus_fragment(ConfigTsunInv1, MsgModbusResp20):
 @pytest.mark.asyncio
 async def test_msg_build_modbus_req(ConfigTsunInv1, MsgModbusCmd):
     ConfigTsunInv1
-    m = MemoryStream(b'', (0,), False)
+    m = MemoryStream(b'', (0,), True)
     m.id_str = b"R170000000000001" 
+    m.state = m.STATE_UP
     await m.send_modbus_cmd(Modbus.WRITE_SINGLE_REG, 0x2008, 0)
     assert 0 == m.send_msg_ofs
     assert m._forward_buffer == b''