S allius/issue102 (#110)

* hotfix: don't send two MODBUS commands together

* fix unit tests

* remove read loop

* optional sleep between msg read and sending rsp

* wait after read 0.5s before sending a response

* add pending state

* fix state definitions

* determine the connection timeout by the conn state

* avoid sending MODBUS cmds in the inverter's reporting phase

* update changelog

app/src/async_stream.py

@@ -15,7 +15,9 @@ class AsyncStream():
     _ids = count(0)
     MAX_PROC_TIME = 2
     '''maximum processing time for a received msg in sec'''
-    MAX_IDLE_TIME = 400
+    MAX_START_TIME = 400
+    '''maximum time without a received msg in sec'''
+    MAX_IDLE_TIME = 90
     '''maximum time without a received msg in sec'''
 
     def __init__(self, reader: StreamReader, writer: StreamWriter,
@@ -30,6 +32,12 @@ class AsyncStream():
         self.proc_start = None  # start processing start timestamp
         self.proc_max = 0
 
+    def __timeout(self):
+        if self.state == State.init:
+            self.MAX_START_TIME
+        else:
+            self.MAX_IDLE_TIME
+
     async def server_loop(self, addr: str) -> None:
         '''Loop for receiving messages from the inverter (server-side)'''
         logger.info(f'[{self.node_id}:{self.conn_no}] '
@@ -85,7 +93,8 @@ class AsyncStream():
                     self.proc_max = proc
                 self.proc_start = None
 
-                await asyncio.wait_for(self.__async_read(), self.MAX_IDLE_TIME)
+                await asyncio.wait_for(self.__async_read(),
+                                       self.__timeout())
 
                 if self.unique_id:
                     await self.async_write()
@@ -169,7 +178,9 @@ class AsyncStream():
         if data:
             self.proc_start = time.time()
             self._recv_buffer += data
-            self.read()                # call read in parent class
+            wait = self.read()                # call read in parent class
+            if wait > 0:
+                await asyncio.sleep(wait)
         else:
             raise RuntimeError("Peer closed.")