try to automate upload of btstack-arduino-latest.zip

platforms/arduino/Makefile

@@ -42,3 +42,4 @@ release: update_version
 	cp -r ${PATHS} ${BTSTACK_PACKAGE}
 	rm -f ${ARCHIVE}
 	zip -r ${ARCHIVE} btstack
+	cp ${ARCHIVE} btstack-arduino-latest.zip

platforms/arduino/upload_latest_sftp.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+USAGE="Usage: upload_latest_sftp.sh host path user"
+
+# command line checks, bash
+if [ $# -ne 3 ]; then
+        echo ${USAGE}
+        exit 0
+fi
+host=$1
+path=$2
+user=$3
+
+echo Uploading generated archive to ${host}/${path} with user ${user}
+
+# SFTP is very peculiar: recursive put only works for a single directory
+sftp ${user}@${host} << EOF
+  put btstack-arduino-latest.zip ${path}
+  quit
+EOF