Dynamic inverter request strings

The binairy string used for requesting data from the inverter is now
generated from the wifi kit s/n. How this string is generated is
explained in the function self.

Author: Woutrrr

HexByteConversion.py

@@ -74,3 +74,21 @@ def getEToday(self):
 
     def getHTotal(self):
         return int(self.__getLong(75, 1))  # Don't divide
+
+def generate_string(ser):
+    '''
+    The request string is build from several parts. The first part is a
+    fixed 4 char string; the second part is the reversed hex notation of
+    the s/n twice; then again a fixed string of two chars; a checksum of
+    the double s/n with an offset; and finally a fixed ending char.
+    '''
+    responseString = '\x68\x02\x40\x30';
+
+    doublehex = hex(ser)[2:]*2
+    hexlist = [ doublehex[i:i+2].decode('hex') for i in 
+        reversed(range(0, len(doublehex), 2))]
+
+    cs_count = 115 + sum([ ord(c) for c in hexlist])
+    cs = hex(cs_count)[-2:].decode('hex')
+    responseString += ''.join(hexlist) + '\x01\x00'+cs+'\x16'
+    return responseString

InverterMsg.py

@@ -11,8 +11,6 @@
 # For PVoutput 
 import urllib, urllib2
 
-import HexByteConversion
-
 # Load the setting
 mydir = os.path.dirname(os.path.abspath(__file__))
 
@@ -22,8 +20,8 @@
 # Receive data with a socket
 ip              = config.get('inverter','ip')
 port            = config.get('inverter','port')
-inverter_string = HexByteConversion.HexToByte(config.get('inverter','inverter_string'))
 use_temp        = config.getboolean('inverter','use_temperature')
+wifi_serial     = config.getint('inverter', 'wifi_sn')
 
 mysql_enabled   = config.getboolean('mysql', 'mysql_enabled')
 mysql_host      = config.get('mysql','mysql_host')
@@ -40,7 +38,6 @@
 
 
 server_address = ((ip, port))
-message = inverter_string
 
 logger = logging.getLogger('OmnikLogger')
 hdlr = logging.FileHandler(log_filename)
@@ -66,11 +63,13 @@
         s = None
         continue
     break
+    
 if s is None:
     if log_enabled:
         logger.error('could not open socket')
     sys.exit(1)
-s.sendall(message)
+    
+s.sendall(InverterMsg.generate_string(wifi_serial))
 data = s.recv(1024)
 s.close()
 

OmnikExport.py

@@ -4,14 +4,14 @@
 
 [inverter]
 # IP address of your Omnik inverter
-ip = 192.168.1.10             
+ip = 192.168.1.10
 # Default for a Omnik with Wifi module
-port = 8899                     
-inverter_string  = 68 02 40 30 b7 54 e6 23 b7 54 e6 23 01 00 44 16
+port = 8899
+# S/N of the wifi kit
+wifi_sn = 602123456
 #use temperature of inverter for pvoutput
 use_temperature = true
 
-
 [mysql]
 # Enable for exporting to a mysql database
 mysql_enabled = false           
@@ -31,4 +31,3 @@ pvout_sysid  = 12345
 [log]
 log_enabled  = true
 log_filename = omnik-export.log
-