Improved script on macosx system

scripts/gen_images.sh

@@ -13,9 +13,18 @@ if [ $# -ne 2 ]; then
   exit 1;
 fi
 
+SED=sed
 MASTER=$1
 DEVICES=$2
 
+if [[ $OSTYPE == "darwin"* ]]; then
+  if ! command -v gsed > /dev/null 2>&1; then
+    echo "You need gnu-sed on darwin system (available with homebrew)"
+    exit 1
+  fi
+  SED=gsed
+fi
+
 if [ ! -e $MASTER ]; then
   echo "The master file $MASTER doesn't exists"
   exit 1;
@@ -31,8 +40,8 @@ for DEVICE in $(cat $DEVICES); do
   deviceeui=$(echo $DEVICE | cut -d : -f 2)
   appeui=$(echo $DEVICE | cut -d : -f 3)
   appkey=$(echo $DEVICE | cut -d : -f 4)
-  echo $name
-  hexdump -ve '1/1 "%.2X"' $MASTERFILE | sed "s/$DEVICEEUI/$deviceeui/; s/$APPEUI/$appeui/; s/$APPKEY/$appkey/" | xxd -r -p > waveofhoney-${name}.bin
+  echo "Generating device $name ($deviceeui)"
+  hexdump -ve '1/1 "%.2X"' $MASTER | $SED "s/${DEVICEEUI}/${deviceeui}/; s/${APPEUI}/${appeui}/; s/${APPKEY}/${appkey}/" | xxd -r -p - ${deviceeui}.bin
 done
 
 exit;