Apparatus, systems and methods for the wireless communication of medical devices in an on-body fluid delivery system are disclosed. A system for on-body fluid delivery includes a primary patch pump adapted to attach a first infusion cannula to a user and to perform a plurality of primary patch pump functions, and a secondary patch pump adapted to attach a second infusion cannula to a user. The secondary patch pump is further adapted to perform a plurality of secondary patch pump functions substantially similar to the plurality of primary patch pump functions if an error condition associated with the primary patch pump is determined.