Specify number of inverters in config.ini (#148)

* Specify number of inverters in config.ini

Added config parameter to  specify amount of computed inverters

* Specify number of inverters in config.ini

Changed config value name.
Updated comments and Readme.md.

* Specify number of inverters in config.ini

Revised Readme and parameter name

* Specify number of inverters in config.ini

Footnotes don't seem to work

* Specify number of inverters in config.ini

Adopted style

README.md

@@ -89,7 +89,8 @@ Within the project there is a file `/data/dbus-opendtu/config.ini`. Most importa
 |-------------------- | ------------- |
 | SignOfLifeLog  | Time in minutes how often a status is added to the log-file `current.log` with log-level INFO |
 | NumberOfTemplates | Number ob Template Inverter to query |
-| DTU |  Which DTU to be used ahoy, opendtu or template REST devices Valid options: opendtu, ahoy, template |
+| DTU | Which DTU to be used ahoy, opendtu or template REST devices Valid options: opendtu, ahoy, template |
+| NumberOfInvertersToQuery | Number of Inverters to query. Set a value larger than "0" when not all inverters should be considered. *1 |
 | useYieldDay | send YieldDay instead of YieldTotal. Set this to 1 to prevent VRM from adding the total value to the history on one day. E.g. if you don't start using the inverter at 0. |
 | ESP8266PollingIntervall |  For ESP8266 reduce polling intervall to reduce load, default 10000ms|
 | Logging | Valid options for log level: CRITICAL, ERROR, WARNING, INFO, DEBUG, NOTSET, to keep logfile small use ERROR or CRITICAL |
@@ -100,6 +101,8 @@ Within the project there is a file `/data/dbus-opendtu/config.ini`. Most importa
 | Username | use if authentication required, leave empty if no authentication needed |
 | Password | use if authentication required, leave empty if no authentication needed |
 
+*1: Please assure that the order is correct in the DTU, we can only extract the first one in a row.
+
 #### Inverter options
 
 This applies to each `INVERTER[X]` section. X is the number of Inverter starting with 0. So the first inverter is INVERTER0, the second INVERTER1 and so on.

config.ini

@@ -8,6 +8,11 @@ NumberOfTemplates=0
 # Which DTU to be used ahoy, opendtu, template
 DTU=opendtu
 
+# If you want to exclude Inverter, specify how many of the Inverters you want to query.
+# Please assure that the order is correct in the DTU, we can only extract the first one in a row.
+# (0=compute number from json response; > 0 use only first x inverters) 
+NumberOfInvertersToQuery = 0
+
 # send YieldDay instead of YieldTotal
 useYieldDay=0
 

dbus-opendtu.py

@@ -33,6 +33,7 @@ def main():
     config.read(f"{(os.path.dirname(os.path.realpath(__file__)))}/config.ini")
     logging_level = config["DEFAULT"]["Logging"].upper()
     dtuvariant = config["DEFAULT"]["DTU"]
+    number_of_inverters = int(config["DEFAULT"]["NumberOfInvertersToQuery"])
 
     try:
         number_of_templates = int(config["DEFAULT"]["NumberOfTemplates"])
@@ -112,7 +113,8 @@ def _v(_p, value: float) -> str:
                 actual_inverter=0,
             )
 
-            number_of_inverters = service.get_number_of_inverters()
+            if number_of_inverters == 0: 
+                number_of_inverters = service.get_number_of_inverters()
 
             if number_of_inverters > 1:
                 # start our main-service if there are more than 1 inverter