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bemasher / rtlamr

An rtl-sdr receiver for Itron ERT compatible smart meters operating in the 900MHz ISM band.
GNU Affero General Public License v3.0
2.19k stars 249 forks source link

identifying IDM packet for Net meters #155

Closed evilpete closed 4 years ago

evilpete commented 4 years ago

How do you detect is a IDM packet is for Net Meters if the both start with the same id data

Preamble 0x5555 SyncWord 0x16A3 ProtocolID 0x1C PacketLength 0x5C HammingCode 0xC6

bemasher commented 4 years ago

Net meters typically have an endpoint type of 8, while non-net meters have type 7.

evilpete commented 4 years ago

That is not what I am observing in the samples i have

{Time":"2020-06-25T08:22:08.569276915-04:00","Offset":1605632,"Length":229376,"Type":"NetIDM","Message":{"Preamble":1431639715,"ProtocolID":28,"PacketLength":92,"HammingCode":198,"ApplicationVersion":4,"ERTType":7,"ERTSerialNumber":1550406067,"ConsumptionIntervalCount":30,"ProgrammingState":184,"LastGeneration":125,"LastConsumption":0,"LastConsumptionNet":2223120656,"DifferentialConsumptionIntervals":[7695,545,2086,1475,6240,2180,4240,4616,240,7191,609,7224,1603,96,2052,12464,6152,8480,9226,352,12312,833,10292,1795,4248,4613,8416],"TransmitTimeOffset":2145,"SerialNumberCRC":61178,"PacketCRC":37271}}

{"Time":"2020-06-25T08:22:52.404629556-04:00","Offset":1835008,"Length":229376,"Type":"IDM","Message":{"Preamble":1431639715,"PacketTypeID":28,"PacketLength":92,"HammingCode":198,"ApplicationVersion":4,"ERTType":7,"ERTSerialNumber":11278109,"ConsumptionIntervalCount":246,"ModuleProgrammingState":188,"TamperCounters":"QgUWry0H","AsynchronousCounters":0,"PowerOutageFlags":"QUgmCEEF","LastConsumptionCount":339972,"DifferentialConsumptionIntervals":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0],"TransmitTimeOffset":476,"SerialNumberCRC":60090,"PacketCRC":31799}}

{"Time":"2020-06-25T08:23:10.23581967-04:00","Offset":2064384,"Length":229376,"Type":"NetIDM","Message":{"Preamble":1431639715,"ProtocolID":28,"PacketLength":92,"HammingCode":198,"ApplicationVersion":4,"ERTType":7,"ERTSerialNumber":1550406067,"ConsumptionIntervalCount":31,"ProgrammingState":184,"LastGeneration":125,"LastConsumption":0,"LastConsumptionNet":54673680,"DifferentialConsumptionIntervals":[8719,481,1060,1218,14444,3076,4232,4617,256,7694,737,3118,1795,2144,3076,152,5644,272,9234,320,11288,769,10292,1667,8296,4873,176],"TransmitTimeOffset":732,"SerialNumberCRC":61178,"PacketCRC":40443}}

{"Time":"2020-06-25T08:26:09.784225228-04:00","Offset":2752512,"Length":229376,"Type":"IDM","Message":{"Preamble":1431639715,"PacketTypeID":28,"PacketLength":92,"HammingCode":198,"ApplicationVersion":4,"ERTType":7,"ERTSerialNumber":13897632,"ConsumptionIntervalCount":172,"ModuleProgrammingState":188,"TamperCounters":"ggOADwgg","AsynchronousCounters":0,"PowerOutageFlags":"oAQAAAAA","LastConsumptionCount":1436228,"DifferentialConsumptionIntervals":[3,2,3,3,3,2,3,3,2,3,5,7,7,5,6,6,2,4,5,4,2,3,4,4,4,4,4,10,10,10,10,10,10,9,9,9,9,10,9,9,9,9,9,10,9,9,9],"TransmitTimeOffset":1390,"SerialNumberCRC":26559,"PacketCRC":31002}} :