midi-request-trigger

A service that triggers HTTP requests and/or MQTT messages when MIDI messages are recieved and triggers MIDI messages when HTTP requests and/or MQTT messages are received.

Install

You can install by building.

Building

Building should be as simple as running:

go build

Running as a service

You are likely going to want to run the tool as a service to ensure it runs at boot and restarts in case of failures. Below is an example service config file you can place in /etc/systemd/system/midi-request-trigger.service on a linux system to run as a service if you install the binary in /usr/local/bin/.

[Unit]
Description=MIDI Request Trigger
After=network.target
StartLimitIntervalSec=500
StartLimitBurst=5

[Service]
ExecStart=/usr/local/bin/midi-request-trigger
ExecReload=/bin/kill -s HUP $MAINPID
Restart=on-failure
RestartSec=5s

[Install]
WantedBy=multi-user.target

Once the service file is installed, you can run the following to start it:

systemctl daemon-reload
systemctl start midi-request-trigger.service

On MacOS, you can setup a Launch Agent in ~/Library/LaunchAgents/com.mrgeckosmedia.midi-request-trigger.plist as follows:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>com.mrgeckosmedia.midi-request-trigger</string>
	<key>ProgramArguments</key>
	<array>
		<string>/path/to/bin/midi-request-trigger</string>
        <string>-c</string>
        <string>/path/to/config.yaml</string>
	</array>
	<key>KeepAlive</key>
	<dict>
		<key>Crashed</key>
		<true/>
		<key>SuccessfulExit</key>
		<false/>
	</dict>
	<key>RunAtLoad</key>
	<true/>
    <key>OnDemand</key>
    <false/>
</dict>
</plist>

Start with:

launchctl load ~/Library/LaunchAgents/com.mrgeckosmedia.midi-request-trigger.plist

Check status with:

launchctl list com.mrgeckosmedia.midi-request-trigger

Stop with:

launchctl unload ~/Library/LaunchAgents/com.mrgeckosmedia.midi-request-trigger.plist

Config

The default configuration paths are:

• ./config.yaml - A file in the current working directory.
• ~/.config/midi-request-trigger/config.yaml - A file in your home directory's config path.
• /etc/midi-request-trigger/config.yaml - A file in the etc config folder.

To verify listener works

You can find the device name by running the following:

midi-request-trigger -l

On MacOS, there is an IAC Driver that can be enabled in Audio MIDI Setup.

---
midi_routers:
  - name: service_notifications
    device: IAC Driver Bus 1
    debug_listener: true

Example note trigger configuration

---
midi_routers:
  - name: service_notifications
    device: IAC Driver Bus 1
    debug_listener: true
    note_triggers:
      - channel: 0
        note: 0
        match_all_velocities: true
        url: http://example.com
        midi_info_in_request: true

Example request trigger configuration

---
midi_routers:
  - name: service_notifications
    device: IAC Driver Bus 1
    debug_listener: true
    request_triggers:
      - channel: 0
        note: 0
        velocity: 1
        midi_info_in_request: true
        uri: /send_note

Example multi part request

---
midi_routers:
  - name: service_notifications
    device: IAC Driver Bus 1
    debug_listener: true
    note_triggers:
      - channel: 0
        note: 0
        match_all_velocities: true
        url: http://example.com
        method: POST
        body: |
          -----------------------------888832887744
          Content-Disposition: form-data; name="message"

          example variable
          -----------------------------888832887744
          Content-Disposition: form-data; name="file"; filename="example.txt"
          Content-Type: text/plain

          Content of file.

          -----------------------------888832887744--          
        headers:
          Content-Type:
            - multipart/form-data; boundary=---------------------------888832887744
        debug_request: true