syxlog is a Mac command line utility that listens to all the connected MIDI inputs and prints ASCII strings to the standard output in response to specific SysEx messages containing them.

Accepted SysEx string format

To be printed to the standard output, the string must be sent as a SysEx with the following format:

0xF0 0x70 <ASCII bytes> 0xF7

We use manufacturer ID 0x70 because it is not likely to be used for other purposes. You are free to choose another byte by changing the constant sysex_id_byte in your code.

How to use

First, compile the program:

make

Then, launch it:

./syxlog

Press Ctrl+C to exit.