[viirb] wait until it comes online

viirb-1-connect-flash-latest-openwrt.sh

@@ -33,11 +33,10 @@ fi
 # don't care about other/old known_host entries
 ssh-keygen  -R ${viirb_ip}
 
-ping -c2 ${viirb_ip}
-if [ $? -ne 0 ]; then
-    echo "Cannot reach any VIIRB - exiting"
-    exit 1
-fi
+while ! ping -c1 ${viirb_ip}; do
+    echo "Cannot ping $viirb_ip yet - waiting"
+    sleep 1
+done
 
 cat ~/.ssh/id_rsa.pub | ssh root@${viirb_ip} "cat > /etc/dropbear/authorized_keys"