RSMB configuration file

[Anisbelakremi1993]

Hello, I am trying to use the RSMB on virtualbox (Ubuntu as guest & windows as host because I couldn't run it with cygwin). When configuring the broker as mentioned by the tutorial, I keep getting "connect for bridge local_bridge_to_mosquitto address 127.0.0.1:1888 failed with TCP error code111"
Am I getting this error because I am using a virtual machine?
I would be grateful if someone can explain to me how to set the IP addresses in the configuration or give me a hint how to solve this.
Thanks in advance
The configuration file currently:
#to trace the output
trace_output protocol

#normal MQTT listener
listener 1887 INADDR_ANY mqtt

#MQTT-SN listener
listener 1886 INADDR_ANY mqtts

#MQTT-S outgoing local bridge
connection local_bridge_to_mosquitto
address 127.0.0.1:1888
topic #out

#MQTT-S outgoing remote bridge
connection remote_bridge_to_mosquitto
address 192.168.1.104:1889
topic #out

[icraggs]

Hi. Linux error code 111 is "connection refused". You could check the Mosquitto log for more information.

I assume you are using RSMB for the MQTT-SN support? Have you tried using the Paho MQTT-SN gateway?

(https://github.com/eclipse/paho.mqtt-sn.embedded-c/tree/master/MQTTSNGateway)