Incorrect state reported by function: "linkDB_Up"

Problem Description:
The function "linkDB_Up" does not always return the correct state of a connection (as connected).

Root cause:
This function relies on internal state variable LINK_CONNECTED. The LINK_CONNECTED is not properly updated therefore so is "linkDB_Up".

Fix:
Check the connection status directly at the link layer to ensure linkDB_Up reports the most accurate connection state.