[SOLVED] How to export/format to MQTT

I try to send a number item (from an rfxcom) to a topic in mqtt, weather/speed.
This is one of the things not working:
In items.file :
Number vind_fart “Vindhastighet m/s [%.1f m/s]” (All_W, Vind_chart) { channel=“rfxcom:wind:0dadea54:38166:windSpeed”, mqtt=">[openhab:weather/speed:state:*:default]"}

Any ideas?