Update balenalib

Dockerfile.template

@@ -1,30 +1,28 @@
 # base-image for node on any machine using a template variable,
-# see more about dockerfile templates here: http://docs.resin.io/deployment/docker-templates/
-# and about resin base images here: http://docs.resin.io/runtime/resin-base-images/
+# see more about dockerfile templates here: https://www.balena.io/docs/learn/develop/dockerfile/ 
+# and about balena base images here: https://www.balena.io/docs/reference/base-images/base-images/ 
 # Note the node:slim image doesn't have node-gyp
-FROM resin/%%RESIN_MACHINE_NAME%%-node:6
+FROM balenalib/%%BALENA_MACHINE_NAME%%-node:9-stretch-build
 
-# use apt-get if you need to install dependencies,
-# for instance if you need ALSA sound utils, just uncomment the lines below.
-#RUN apt-get update && apt-get install -yq \
-#    alsa-utils libasound2-dev && \
-#    apt-get clean && rm -rf /var/lib/apt/lists/*
+# use `install_packages` if you need to install dependencies,
+# # for instance if you need git, just uncomment the line below.
+# # RUN install_packages git
 
 # Defines our working directory in container
 WORKDIR /usr/src/app
 
 # Copies the package.json first for better cache on later pushes
 COPY package.json package.json
 
-# This install npm dependencies on the resin.io build server,
-# making sure to clean up the artifacts it creates in order to reduce the image size.
-RUN JOBS=MAX npm install --production --unsafe-perm && npm cache clean && rm -rf /tmp/*
+# This install npm dependencies on the balena build server,
+# # making sure to clean up the artifacts it creates in order to reduce the image size.
+RUN JOBS=MAX npm install --production --unsafe-perm && npm cache verify && rm -rf /tmp/
 
 # This will copy all files in our root to the working  directory in the container
 COPY . ./
 
-# Enable systemd init system in container
-ENV INITSYSTEM on
+# Enable udevd so that plugged dynamic hardware devices show up in our container.
+ENV UDEV=1
 
 # server.js will run when container starts up on the device
 CMD ["npm", "start"]

app.js

@@ -1,13 +1,15 @@
+console.log('Starting');
+
 var  ledToggle, pressCount;
 //provision the gpio pins 22 for the led output and 17 for the button input
-var led= require("pi-pins").connect(22),
+var led = require("pi-pins").connect(22),
     button = require("pi-pins").connect(17);
 
 //set the pin mode,  setting pin 22 as an output and 17 as an input
 button.mode('in');
 led.mode('out');
 
-//set the initial value of the LED to be off.
+//set the initial value of the LED to be on.
 ledToggle = false;
 pressCount= 0;
 led.value(true);