  Mez is a publish-subscribe messaging system for latency sensitive
multi-camera machine vision at the IoT Edge. Unlike existing messaging systems,
Mez allows applications to specify latency, and application accuracy bounds.
Mez implements a network latency controller that dynamically adjusts the video
frame quality to satisfy latency, and application accuracy requirements.
Additionally, the design of Mez utilizes application domain specific features
to provide low latency operations. Experimental evaluation on an IoT Edge
testbed with a pedestrian detection machine vision application indicates that
Mez is able to tolerate latency variations of up to 10x with a worst-case
reduction of 4.2\% in the application accuracy F1 score metric.
