Revert "We have removed isAdvertising() symbol"

This reverts commit c6860696506720704ce4ca71d70d18924e1168c9.
Revert "Typo"

This reverts commit 947eeb517a8e886d95fe0a4f5438818686eb57a6.
Revert "Remove isAdvertising()"

This reverts commit e8f2f58fef801aebb325b8ee489cd52f113df52d.
Revert "Revert some changes of KLP MR2"

This reverts commit 2760ee05166ee8437094694d4076141db0a4cbc6.