I\'ve been told that MQTT-SN could work with bluetooth instead of TCP/IP.
I downloaded RSMB from http://git.eclipse.org/c/mosquitto/org.eclipse.mosquitto.rsmb.git
The MQTT-SN support in RSMB is for MQTT-SN over UDP.
To use MQTT-SN over Bluetooth you will need to implement a Forwarder as described in section 5.5 of the spec to bridge between a MQTT-SN gateway and a client on the Bluetooth device.