[mh] Programming a new serial protocol

[Pilfos <pi...@gm...>]

Hello,

I'm starting to study MisterHouse "architecture", and before going deep I
would like to know If it will be easy to develop a new serial protocol.

I have a "custom" hardware, IHC from Denmark. This hardware has it's own
protocol that works with RS485, but I could communicate with a RS232/RS485
converter. Basically, I can send & receive hex numbers in ascii. For
example, each message that I send or receive, start with 0x02. Each message
ends with 0x17. After the 0x17 always a CRC appears, that is the sum of all
the numbers of the message. For example, to get the status of all the
outputs of the system:

a) IHC is sending this commmand: 02 1C 30 17 65    ( The system is ready)

b) After that, the PC sends:  02 12 82 17 AD     (ask for Getting the output
status, lights)

c) IHC answers: 02 1C 83 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 17
B9      (Return the outputs on)

There is 1 light ON.

There are commands to switch ON & switch OFF outputs, requests the inputs
(buttons pressed).

As you can see the protocol is easy to understand. Is there any source code
with sending & receiving ascii through serial, with events, which I could
modify easily under Misterhouse?

Thanks in advance!

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