Add support for S440 optimizers (#168)

Tested on 2022-03-12 with a SE6K inverter

se/data.py

@@ -153,6 +153,10 @@ def parseDeviceData(data):
             optDict[seId] = parseNewOptData(seId, optItems,
                                             data[dataPtr:dataPtr + devLen])
             logDevice("optimizer:     ", seType, seId, devLen, optDict[seId])
+        elif seType == 0x0082:  # s440 optimizers
+            optDict[seId] = parseS440OptData(seId, optItems,
+                                            data[dataPtr:dataPtr + devLen])
+            logDevice("optimizer:     ", seType, seId, devLen, optDict[seId])
         elif seType == 0x0010:  # inverter data
             invDict[seId] = parseInvData(seId, invItems,
                                          data[dataPtr:dataPtr + devLen])
@@ -237,6 +241,20 @@ def parseNewOptData(seId, optItems, devData):
     return devDataDict(seId, optItems,
                        [timeStamp, 0, uptime, vpan, vopt, imod, eday, temp])
 
+def parseS440OptData(seId, optItems, devData):
+    data = bytearray()
+    data.extend(devData)
+    (timeStamp, uptime) = struct.unpack("<LH", devData[0:6])
+    vpan = 0.125 * (data[6] | (data[7] << 8 & 0x300))
+    vopt = 0.125 * (data[7] >> 2 | (data[8] << 6 & 0x3c0))
+    imod = 0.00625 * (data[9] << 4 | (data[8] >> 4 & 0xf))
+    # we don't have those fields
+    eday = 0
+    temp = 0
+    # Don't have an inverter ID in the data, substitute 0
+    return devDataDict(seId, optItems,
+                       [timeStamp, 0, uptime, vpan, vopt, imod, eday, temp])
+
 # create a dictionary of device data items
 def devDataDict(seId, itemNames, itemValues):
     devDict = {}

se/dataparams.py

@@ -167,4 +167,20 @@
 #  voltage Panel, 10 bit (1/8 v)
 #  Uptime of optimiser, 16 bit (secs)
 #  DateTime, 32 bit (secs)
+
+# Decode optimiser data in packet type 0x0082
+#  (into same order as original data)
+#
+# Byte index (in reverse order):
+#
+# 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
+# ?? ?? ?? ?? ?? Cc cO o# pp Uu uu Dd dd dd dd
+#  # = oo|Pp
+#  ?? ?? ?? ?? ?? always contain the same bytes
+#
+#  Current (panel), 12 bit (1/160 Amp)
+#  voltage Output, 10 bit (1/8 v)
+#  voltage Panel, 10 bit (1/8 v)
+#  Uptime of optimiser, 16 bit (secs)
+#  DateTime, 32 bit (secs)
 #