Minimal start with a custom logger and device tracker.

.editorconfig

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+# http://editorconfig.org/
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.gitignore

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+/node_modules/

bin/stf

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+#!/usr/bin/env node
+require('../lib/cli')

lib/cli.js

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+var program = require('commander')
+
+var pkg = require('../package')
+
+program
+  .version(pkg.version)
+
+program
+  .command('provider')
+  .description('run STF provider')
+  .action(function() {
+    require('./provider')
+  })
+
+program.parse(process.argv)

lib/provider.js

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+var adb = require('adbkit')
+var async = require('async')
+
+var log = require('./util/logger').createLogger('provider')
+var client = adb.createClient()
+
+client.trackDevices(function(err, tracker) {
+  if (err) {
+    log.fatal('Unable to track devices: %s', err.message)
+    throw err
+  }
+
+  log.info('Tracking devices')
+
+  tracker.on('add', function(device) {
+    log.info('Found device "%s" (%s)', device.id, device.type)
+  })
+
+  tracker.on('change', function(device) {
+    log.info('Device "%s" is now "%s"', device.id, device.type)
+  })
+
+  tracker.on('remove', function(device) {
+    log.info('Lost device "%s" (%s)', device.id, device.type)
+  })
+})

lib/util/logger.js

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+var util = require('util')
+
+function Log(tag, stream) {
+  this.tag = tag
+  this.stream = stream || process.stderr
+  this.levels = {
+    DEBUG: 'DBG'
+  , VERBOSE: 'VRB'
+  , INFO: 'INF'
+  , WARNING: 'WRN'
+  , ERROR: 'ERR'
+  , FATAL: 'FTL'
+  }
+}
+
+Log.prototype.debug = function() {
+  this._write(this._format(this.levels.DEBUG, arguments))
+}
+
+Log.prototype.verbose = function() {
+  this._write(this._format(this.levels.VERBOSE, arguments))
+}
+
+Log.prototype.info = function() {
+  this._write(this._format(this.levels.INFO, arguments))
+}
+
+Log.prototype.warn = function() {
+  this._write(this._format(this.levels.WARNING, arguments))
+}
+
+Log.prototype.error = function() {
+  this._write(this._format(this.levels.ERROR, arguments))
+}
+
+Log.prototype.fatal = function() {
+  this._write(this._format(this.levels.FATAL, arguments))
+}
+
+Log.prototype._format = function(priority, args) {
+  return util.format('%s %s/%s %d %s\n',
+    Log.prefix, priority, this.tag, process.pid, util.format.apply(util, args))
+}
+
+Log.prototype._write = function(out) {
+  this.stream.write(out)
+}
+
+Log.prefix = '*'
+
+Log.createLogger = function(tag) {
+  return new Log(tag)
+}
+
+Log.setPrefix = function(prefix) {
+  Log.prefix = prefix
+}
+
+exports = module.exports = Log

test/util/logger.js

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+var chai = require('chai')
+var expect = chai.expect
+
+var logger = require('../../lib/util/logger')
+
+describe('Logger', function() {
+
+  it('should have a createLogger method', function() {
+    expect(logger).itself.to.respondTo('createLogger')
+  })
+
+})