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/tests/test_solarman.py

@@ -852,8 +852,7 @@ def test_read_message_in_chunks2(ConfigTsunInv1, DeviceIndMsg):
     assert m.data_len == 0xd4
     assert m.msg_count == 1
     assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
-    while m.read(): # read rest of message
-        pass
+    m.read()        # read rest of message
     assert m.msg_count == 1
     assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
     assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0