@mariaclaudia: run calibre in debug mode. The wireless device driver will print some information about ports. Post that information here.
Example:
Code:
SMART_DEV ( 0.00: 0.003) _attach_to_port try ip address "" on port 9090
SMART_DEV ( 0.95: 0.852) _startup_on_demand listening on port 9090
SMART_DEV ( 0.97: 0.001) _attach_to_port try ip address "" on port 54982
SMART_DEV ( 0.98: 0.000) _startup_on_demand broadcast socket listening on port 54982
SMART_DEV ( 2.00: 1.014) run All IP addresses {'{4AFD7AF6-F037-4FA9-B866-8B2334C445C9}': [{'addr': u'192.168.120.4', 'netmask': u'255.255.255.255', 'broadcast': u'192.168.120.4'}], '{F0151E9B-47CA-11E7-93A5-806E6F6E6963}': [{'addr': u'127.0.0.1', 'netmask': u'255.255.255.255', 'broadcast': u'127.0.0.1'}]}
In particular, check if you have specified an IP address in the smart device configuration. In calibre, go to Preferences / Plugins / Device interface plugins / Smartdevice App interface. Tap "Customize this plugin". Check if there is something in the "Use this IP address" box. If there is something there, make sure that it is the correct IP address.