I have installed the IotAgent base, ul20 and mqtt on CENTOS6.6. The ul20 works well with figway,  but it seems that mqtt biding does not work with fatal error (from log file) :

[fiware@centimeter tmp]$ cat IoTAgent-qa.log | grep FATAL
270815T100223,516.010CEST|lvl=FATAL|comp=iota:qa|op=main|[140291558479904:main.cc:295] ======= IoTAgent StartingWebServer: 192.168.1.24 ========
270815T100223,979.270CEST|lvl=FATAL|comp=iota:qa|op=main|[140291558479904:main.cc:383] bad argument: FileName
270815T100224,040.062CEST|lvl=FATAL|comp=iota:qa|op=main|[140291558479904:main.cc:383] unable to open plugin: MqttService
[



[fiware@centimeter tmp]$ cat IoTAgent-mqtt.log | grep FATAL
270815T100223,515.633CEST|lvl=FATAL|comp=iota:mqtt|op=main|[140470741796896:main.cc:295] ======= IoTAgent StartingWebServer: 192.168.1.24 ========
270815T100223,979.580CEST|lvl=FATAL|comp=iota:mqtt|op=main|[140470741796896:main.cc:383] bad argument: FileName
270815T100224,040.397CEST|lvl=FATAL|comp=iota:mqtt|op=main|[140470741796896:main.cc:383] unable to open plugin: MqttService
270815T100224,144.187CEST|lvl=FATAL|comp=iota:mqtt|op=main|[140470741796896:main.cc:402] bind: Permission denied

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This is my ini_iotagent.sh script :

[fiware@centimeter iot]$ cat init_iotagent.sh
 export LD_LIBRARY_PATH=/usr/local/iot/lib

/usr/local/iot/bin/iotagent -n qa -p 8080 -i 192.168.1.24 -d /usr/local/iot/lib -c ./config.json -v DEBUG  &

/usr/local/iot/bin/iotagent -n mqtt -p 80 -i 192.168.1.24 -d /usr/local/iot/lib -c ./config.json -v DEBUG  &

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This is my config.json file :

[fiware@centimeter iot]$ cat config.json
{
    "ngsi_url": {
        "cbroker": "http://127.0.0.1:1026",
        "updateContext": "/NGSI10/updateContext",
        "registerContext": "/NGSI9/registerContext",
        "queryContext": "/NGSI10/queryContext"
    },
    "timeout": 10,
    "http_proxy": "192.0.0.2:3128",
    "public_ip": "10.95.200.200:20000",
    "dir_log": "/tmp/",
    "timezones": "/etc/iot/date_time_zonespec.csv",
    "storage": {
        "host": "127.0.0.1",
        "type": "mongodb",
        "port": "27017",
        "dbname": "iot"
    },
   "resources": [
        {
            "resource": "/iot/d",
            "options": {
                "FileName": "UL20Service"
            }
         },
         {
            "resource": "/iot/mqtt",
            "options": {
            "ConfigFile": "/etc/iot/MqttService.xml",
            "FileName": "MqttService"
            }
         }
   ]
}

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[fiware@centimeter iot]$  ls -l /usr/local/iot/lib
total 105408
-rwxr-xr-x. 1 root root    88757 Mar 31 16:53 libboost_date_time.so.1.55.0
-rwxr-xr-x. 1 root root   120698 Mar 31 16:53 libboost_filesystem.so.1.55.0
-rwxr-xr-x. 1 root root  1182623 Mar 31 16:53 libboost_regex.so.1.55.0
-rwxr-xr-x. 1 root root    18195 Mar 31 16:53 libboost_system.so.1.55.0
-rwxr-xr-x. 1 root root   134716 Mar 31 16:53 libboost_thread.so.1.55.0
-rwxr-xr-x. 1 root root 54606522 Mar 31 16:53 libiota.so
-rwxr-xr-x. 1 root root  4665856 Mar 31 16:53 liblog4cplus-1.1.so
-rwxr-xr-x. 1 root root 17345052 Mar 31 16:53 libmongoclient.so
-rwxr-xr-x. 1 root root 15407885 Mar 31 16:53 libpion-5.0.so
-rwxr-xr-x. 1 root root  8441013 May 29 14:27 MqttService.so
-rwxr-xr-x. 1 root root  5908302 Mar 31 16:54 UL20Service.so

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[fiware@centimeter iot]$ rpm -qa | grep mosquitto
mosquitto-1.4.2-3.2.x86_64
libmosquittopp1-1.4.2-3.2.x86_64
mosquitto-clients-1.4.2-3.2.x86_64
libmosquitto1-1.4.2-3.2.x86_64
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Also, it seems that mosquitto works well:

mosquitto
mosquitto_sub -v -t '/apikey2/Temp-RoomLino/+'
mosquitto_pub -t '/apikey2/Temp-RoomLino/temperature' -m 45.2 -u apikey2

on the subscription windows i can see:
[fiware@centimeter ~]$ mosquitto_sub -v -t '/apikey2/Temp-RoomLino/+'
/apikey2/Temp-RoomLino/temperature 45.2
/apikey2/Temp-RoomLino/temperature 45