Just tested on fresh openhabian install - with OH2.3 problem persist, with OH2.2 everything works as expected =(

With version 2.2 everything worked great, but after I updated OH to stable 2.3 MySensors MQTT binding always with "Initializing" status like this
OH2 logs seems to be fine

==> /var/log/openhab2/events.log <==

2018-06-14 14:06:07.939 [hingStatusInfoChangedEvent] - 'mysensors:bridge-mqtt:4d219998' changed from UNINITIALIZED to INITIALIZING

==> /var/log/openhab2/openhab.log <==

2018-06-14 14:06:07.959 [DEBUG] [ensors.factory.MySensorsCacheFactory] - Cache file: given_ids.cached exist.

2018-06-14 14:06:08.036 [DEBUG] [ensors.factory.MySensorsCacheFactory] - Cache (given_ids) content: []

2018-06-14 14:06:08.070 [DEBUG] [rotocol.mqtt.MySensorsMqttConnection] - Enabling connection watchdog

2018-06-14 14:06:08.179 [DEBUG] [org.openhab.binding.mysensors       ] - ServiceEvent REGISTERED - {org.eclipse.smarthome.config.discovery.DiscoveryService}={service.id=351, service.bundleid=235, service.scope=singleton} - org.openhab.binding.mysensors

2018-06-14 14:06:08.251 [DEBUG] [.discovery.MySensorsDiscoveryService] - Starting MySensors discovery scan

2018-06-14 14:06:08.283 [DEBUG] [nsors.handler.MySensorsBridgeHandler] - Initialization of the MySensors bridge DONE! 

and it connects to mosquitto as usual with no errors

1528958279: New connection from 127.0.0.1 on port 1883.
1528958280: New client connected from 127.0.0.1 as paho36475635492761 (c1, k60, u'mk-sensors').
1528959641: Saving in-memory database to /var/lib/mosquitto/mosquitto.db.

I'm using org.openhab.binding.mysensors-2.3.0-SNAPSHOT.jar, is it latest release?

@gohan that's the point - I don't wanna use any relays - I want to build small case with stepper motor and a little driver inside

@korttoma oh thanks, i'll check that thread later. I'm trying to make it more compact and with some additional sensors, but base is same I think )

@gohan yeah I saw that project, but that's for semi-automatic roller shutter, am I right? I want to make a node for manual cover with that chain-like string (actually it's small spheres, i don't know how it's called) with stepper motor. Anyway I'm fine without additional variables already )

@gohan i thought of using it as a flag for calibrating sequence (marking top and bottom position, counting steps etc)

I'm using last stable versions of OH2 and MySensors with MQTT binding and building some cheap arduino based rollershutter, everything worked fine, until I sent V_VAR1 variable to controller - then it sets V_PERCENTAGE to 0 and doesn't change V_VAR1 at all.
And now i have an idea that V_VARx variables is not supported in OH2 for rollershutter, am I right?