I am trying to create a communication interface using C Language to an Air conditioning system, after analyzing the data packets I have identified that the data packet is consist of an 8 bit CRC (I am pretty sure the CRC is the last byte because the rest of the data only changes when I change something in the settings).
So what I need to do now is to be able to reverse engineer the process on how to come up with this CRC
A802000000001F5D0000000073 A802000000001E5D0000000070 A802000000001D5D0000000071
In the data above I purposely changed
1D and as you can see the value of last byte changed from
I tried different on-line CRC calculators but still had no luck.
I managed to capture more data samples:
A80300000004045D0000000045 A80300000004055D0000000044 A803000000040F61000000004A A802000000040F61000000004B A81200004004169A00000000FB A81200004004159A00000000F8 A81200004004149A00000000E5 A81200084000149C00000000E7 A83200084000149C0000000087 A85200084000149C00000000A7
Any help would be greatly appreciated.