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GatewayClient gw = new GatewayClient(new ConnectionInfo(ConnectionType.ZIGBEE_UART, "/dev/ttyUSB0"));
...
// turn a light device on
final Device d = gw.getDevice(id);
Property property = new Property("OnOff, "boolean", "{\"value\":true}"); // value is a JSON string with the new value
of the property
d.updateProperty(property).getFuture().whenComplete( (result, throwable) -> {
    if (throwable != null) {
        System.out.println("error: " + throwable.getMessage());
        System.out.println("suggestion: ensure you are forming the correct JSON request, with property key:value pairs");
    } else if (result != null) {
        System.out.println("result: " + result.getValue());    
    }
});