Disclosed herein are hub-based wireless networks employing end-devices at intermediate wireless at ranges of thousands of meters. End-devices may be such things as keypads, door latches, occupancy monitors, sprinkler controllers and other devices controlled or monitored in a campus or a collection of buildings. A synchronous mode is used requiring each paired end-device to timely respond to regular packets initiated at a hub. The hub monitors the quality of a communications link on a channel to each end-device, and applies varying levels of redundancy based upon a recent history of success and failure of packet exchanges, which measurement may be a value of badness increased as errors are encountered and decreased as packet communication is successful. Detailed information on various example embodiments of the inventions are provided in the Detailed Description below, and the inventions are defined by the appended claims.