Just playing around with different options that could be added to the app object to help developer manage plugin state. Hope to add to the server.

Usage

const { wrapPlugin } = require('signalk-plugin-state')

function initPlugin(app) {
  return {
    id: 'sk-example',
    name: 'SK Example Plugin',
    description: 'Something that does a think with SK.',
    schema,
    start: buildStart(app),
    stop: buildStop(app),
    // uiSchema,
  }
}

module.exports = wrapPlugin(initPlugin)

API

app.ref

Object with the following methods:

• addInterval(id, func, seconds) - Automatically cleared when plugin.stop() is called.
• set(id, func) - Set references to methods or values.
• get(id) - Returns method or value.
• invoke(id) - Calls reference method.
• clear() - Removes all references. Does not unsubscribe or similar. Just removes any saved refs.

Helpers

• Any function added via app.ref.set(['onClose', id]) will be called on plugin.close() automatically.
• Validation of plugin props against schema before sending to plugin.
• Calls app.ref.clear() on plugin.close().