Since there are many variables in pairing ANT has enabled some helpful pairing options for the user based on the challenges of unknown (ad hoc) connections and multiple nodes in the vicinity.  Some recommended solutions include using a wild card (zero value) in channel ID variables which allows the user to see all available devices in that frequency. Isolating the two nodes to be paired by making sure the application is out of RF range of any other nodes is another suggestion. It is also possible to use a pairing bit in the channel ID set on purpose by an application or user action. Only nodes with a matching pairing bit will connect, eliminating other nodes in vicinity. Additionally, use the built-in proximity channel option which allows the user to configure reception in levels of radio signal strength that allow connection. The highest signal strength is the closest node (refer to AN12). Finally, scan for all devices in the area and decide which is desired to connect with. A background scan is much the same as a search without the node association. Full time scan is good for pure asynchronous node communication.