Multi Protocol Decoding

Rtlamr now has preliminary support for concurrent multi-protocol decoding. A few design decisions make certain pairs of protocols very efficient to decode simultaneously, while others require almost all of their own signal processing to arrive at a decoded message.

Rules:

• -msgtype takes a comma-separated list of protocols to decode simultaneously.
• Protocols with the same preamble will share some signal processing steps to improve performance.
• -msgtype=all includes the following protocols: scm, scm+, idm, r900 and is intended to be used for discovery. The omitted protocols share preamble and CRC with at least one protocol in the list and differ only in packet interpretation.
• r900 and r900bcd are fairly resource heavy and should not be used concurrently with other protocols on low-power systems like RPi's.

Protocol	Preamble	Comment
scm	0x1F2A60
scm+	0x16A3
idm	0x555516A3	Used with type 7 meters.
netidm	0x555516A3	Same as idm, used with type 8 meters.
r900	0xE564
r900bcd	0xE564	Same as r900, used for meters reporting binary coded digits for consumption.