Was able to get it to work by installing all the plugins available in the EVOthings client, but had to install the git current version instead of the "released" version. Not sure which of the plugins besides the ble plugin are required; didn't have time to add them one-by-one.
cordova plugin add org.apache.cordova.battery-status
cordova plugin add org.apache.cordova.camera
cordova plugin add org.apache.cordova.console
cordova plugin add org.apache.cordova.device
cordova plugin add org.apache.cordova.device-motion
cordova plugin add org.apache.cordova.device-orientation
cordova plugin add org.apache.cordova.dialogs
cordova plugin add org.apache.cordova.geolocation
cordova plugin add org.apache.cordova.globalization
cordova plugin add org.apache.cordova.inappbrowser
cordova plugin add org.apache.cordova.network-information
cordova plugin add org.apache.cordova.vibration
cordova plugin add org.chromium.system.network
cordova plugin add org.chromium.socket
cordova plugin add org.chromium.sockets.tcp
cordova plugin add org.chromium.sockets.udp
cordova plugin add com.unarin.cordova.beacon
cordova plugin add pl.makingwaves.estimotebeacons
cordova plugin add de.appplant.cordova.plugin.local-notification
cordova plugin add com.megster.cordova.bluetoothserial
cordova plugin add com.evothings.blecordova plugin add https://github.com/evothings/cordova-ble.git