GDL90 is a popular binary protocol used in general aviation for communication between ADS-B devices and Electronic Flight Bag (EFB) apps. Since version 2.6 adsb_hub can send traffic to any GDL90 compatible EFB app such as ForeFlight or AvPlan EFB.
In order to do that you need to add new output with following parameters:
type - gdl90
name - any string
host - text with IP address of the device running EFB app, only one device currently supported
port - usually 4000
Example of json file with gdl90 output