Revert "removed lock"
Revert "removed lock"

This reverts commit 3699d4443ff917a4eaca6894aa05fd965f786a4e.

incima/NMEAremote-plus-Pebble,incima/NMEAremote-plus-Pebble,incima/NMEAremote-plus-Pebble,incima/NMEAremote-plus-Pebble