Add support for TR-502MSV remote controller for RC-710 smart sockets

[filipkosecek]

I have written a decoder for TR-502MSV smart socket controller, see merbanan/rtl_433_tests#467.

[zuckschwerdt]

Thanks, this looks good. It is written in an unusal way for our decoders though. We usually don't have single-use functions but a straight decode function. Also reformatting the bits before pulling out values seems unneeded, simply grabbing the needed bits with a mask and shifts over b[] would be a more general approach. E.g.

int device_id = ((b[0] & 0x7f) << 5) | (b[1] >> 3);

And command could be a lookup, something like:

char const *commands[] = { "OFF", "BRIGHT", "DIM", ON" };
int command = (b[2] >> 6);
char const *command_str = commands[command];

Are you ok to apply those simplifications?

Also can you table some codes, maybe reset the device a few times to get new IDs, so we can examine the UU checksum?

[filipkosecek]

Sure, I will try to incorporate your suggestions. The get_sock_id function is OK or should I inline that one as well?

As for the checksum, ID doesn't seem to affect UU bits. Anyway, I will try to table some more samples with multiple IDs and upload it to the test repository in the following days.

[zuckschwerdt]

Yes, get_sock_id could look like the command example above.

You can just post a list of codes right here, easier to discuss.

[filipkosecek]

I am adding some more samples with a different Device ID.

Preamble	Device id	Socket id	Command	Reserved	Unknown
1	111010001000	000	00	0	00
1	111010001000	000	10	0	01
1	111010001000	100	00	0	10
1	111010001000	100	10	0	11
1	111010001000	010	00	0	01
1	111010001000	010	10	0	00
1	111010001000	110	00	0	11
1	111010001000	110	10	0	10
1	111010001000	111	01	0	11
1	111010001000	111	11	0	10
1	111010001000	111	00	0	01
1	111010001000	111	10	0	00
1	101110001000	000	00	0	00
1	101110001000	000	10	0	01
1	101110001000	100	00	0	10
1	101110001000	100	10	0	11
1	101110001000	010	00	0	01
1	101110001000	010	10	0	00
1	101110001000	110	00	0	11
1	101110001000	110	10	0	10
1	101110001000	111	01	0	11
1	101110001000	111	11	0	10
1	101110001000	111	00	0	01
1	101110001000	111	10	0	00
1	000011001000	000	00	0	00
1	000011001000	100	00	0	10
1	000011001000	110	00	0	11
1	000001001000	100	10	0	11
1	000001001000	110	10	0	10
1	000001001000	111	00	0	01
1	011101001000	000	11	0	11
1	011101001000	100	00	0	10
1	011101001000	111	10	0	00