Refactoring async stream (#194)

* GEN3: Invalid Contact Info Msg
Fixes #191

* introduce ifc with FIFOs

* add object factory

* use AsyncIfc class with FIFO

* declare more methods as classmethods

* - refactoring

- remove _forward_buffer
- make async_write private

* remove _forward_buffer

* refactoring

* avoid mqtt handling for invalid serial numbers

* add two more callbacks

* FIX update_header_cb handling

* split AsyncStream in two classes

* split ConnectionG3(P) in server and client class

* update class diagramm

* refactor server creation

* remove duplicated imports

* reduce code duplication

* move StremPtr instances into Inverter class

* resolution of connection classes

- remove ConnectionG3Client
- remove ConnectionG3Server
- remove ConnectionG3PClient
- remove ConnectionG3PServer

* fix server connections

* fix client loop closing

* don't overwrite self.remote in constructor

* update class diagramm

* fixes

- fixes null pointer accesses
- initalize AsyncStreamClient with proper
  StreamPtr instance

* add close callback

* refactor close handling

* remove connection classes

* move more code into InverterBase class

* remove test_inverter_base.py

* add abstract inverter interface class

* initial commit

* fix sonar qube warnings

* rename class Inverter into Proxy

* fix typo

* move class InverterIfc into a separate file

* add more testcases

* use ProtocolIfc class

* add unit tests for AsyncStream class

* icrease test coverage

* reduce cognitive complexity

* increase test coverage

* increase tes coverage

* simplify heartbeat handler

* remove obsolete tx_get method

* add more unittests

* update changelog

* remove __del__ method for proper gc runs

* check releasing of ModbusConn instances

* call garbage collector to release unreachable objs

* decrease ref counter after the with block

app/src/infos.py

@@ -378,15 +378,19 @@ class Infos:
 
         return None                  # unknwon idx, not in info_defs
 
-    def inc_counter(self, counter: str) -> None:
+    @classmethod
+    def inc_counter(cls, counter: str) -> None:
         '''inc proxy statistic counter'''
-        db_dict = self.stat['proxy']
+        db_dict = cls.stat['proxy']
         db_dict[counter] += 1
+        cls.new_stat_data['proxy'] = True
 
-    def dec_counter(self, counter: str) -> None:
+    @classmethod
+    def dec_counter(cls, counter: str) -> None:
         '''dec proxy statistic counter'''
-        db_dict = self.stat['proxy']
+        db_dict = cls.stat['proxy']
         db_dict[counter] -= 1
+        cls.new_stat_data['proxy'] = True
 
     def ha_proxy_confs(self, ha_prfx: str, node_id: str, snr: str) \
             -> Generator[tuple[str, str, str, str], None, None]: