Fix #107: silence IDE noise during CI builds

.travis.yml

@@ -14,7 +14,7 @@
 ##############################################################################
 
 dist: trusty
-sudo: false
+sudo: true
 
 env:
  global:
@@ -39,6 +39,16 @@ matrix:
         - if [ ! -d "$HOME/arduino_ide" ] ; then mkdir "$HOME/arduino_ide" ; fi
         - if [ ! -d "$HOME/$ARDUINO_IDE" ] ; then { echo "fetch" && wget https://downloads.arduino.cc/arduino-${IDE_VERSION}-linux64.tar.xz && echo "untar" && tar xf arduino-${IDE_VERSION}-linux64.tar.xz && echo "move" && mv -f arduino-${IDE_VERSION} $HOME/${ARDUINO_IDE} ; } || { echo "IDE install failed"; exit 1; } ; else echo "IDE already installed" ; fi
         - export PATH="$HOME/${ARDUINO_IDE}:$PATH"
+
+        # Arduino IDE adds a lot of noise caused by network traffic, firewall it off
+        # (see https://github.com/per1234/arduino-ci-script/issues/1#issuecomment-504158113)
+        - sudo iptables -P INPUT DROP
+        - sudo iptables -P FORWARD DROP
+        - sudo iptables -P OUTPUT ACCEPT
+        - sudo iptables -A INPUT -i lo -j ACCEPT
+        - sudo iptables -A OUTPUT -o lo -j ACCEPT
+        - sudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
+
         #
         # arduino_lorawan looks for project_config things, so we must put
         # things in the canonical place