Wi-Fi Aware unsynchronized service discovery (NAN USD) ====================================================== This document descibes how the unsynchronized service discovery defined in the Wi-Fi Aware specification v4.0 can be used with wpa_spplicant. More information about Wi-Fi Aware is available from this Wi-Fi Alliance web page: https://www.wi-fi.org/discover-wi-fi/wi-fi-aware Build config setup ------------------ The following parameters must be included in the config file used to compile hostapd and wpa_supplicant. wpa_supplicant build config --------------------------- Enable NAN USD in wpa_supplicant build config file CONFIG_NAN_USD=y Control interface commands and events ------------------------------------- Following control interface commands can be used: NAN_PUBLISH service_name=<name> [ttl=<time-to-live-in-sec>] [freq=<in MHz>] [freq_list=<comma separate list of MHz>] [srv_proto_type=<type>] [ssi=<service specific information (hexdump)>] [solicited=0] [unsolicited=0] [fsd=0] If ttl=0 or the parameter is not included, only one Publish message is transmitted. If freq is not included, the default frequency 2437 MHz (channel 6 on the 2.4 GHz band) is used. If freq_list is included, publisher iterates over all the listed channels. A special freq_list=all value can be used to generate the channel list automatically based on the list of allowed 2.4 and 5 GHz channels. srv_proto_type values are defined in the Service Protocol Types table in the Wi-Fi Aware specification. This command returns the assigned publish_id value or FAIL on failure. This command maps to the Publish() method in the NAN Discovery Engine. NAN_CANCEL_PUBLISH publish_id=<id from NAN_PUBLISH> This command maps to the CancelPublish() method in the NAN Discovery Engine. NAN_UPDATE_PUBLISH publish_id=<id from NAN_PUBLISH> [ssi=<service specific information (hexdump)>] This command maps to the UpdatePublish() method in the NAN Discovery Engine. NAN_SUBSCRIBE service_name=<name> [active=1] [ttl=<time-to-live-in-sec>] [freq=<in MHz>] [srv_proto_type=<type>] [ssi=<service specific information (hexdump)>] If ttl=0 or the parameter is not included, operation is terminated once the first matching publisher is found. If freq is not included, the default frequency 2437 MHz (channel 6 on the 2.4 GHz band) is used. srv_proto_type values are defined in the Service Protocol Types table in the Wi-Fi Aware specification. This command returns the assigned subscribe_id value or FAIL on failure. This command maps to the Subscribe() method in the NAN Discovery Engine. NAN_CANCEL_SUBSCRIBE subscribe_id=<id from NAN_SUBSCRIBE> This command maps to the CancelSubscribe() method in the NAN Discovery Engine. NAN_TRANSMIT handle=<id from NAN_PUBLISH or NAN_SUBSCRIBE> req_instance_id=<peer's id> address=<peer's MAC address> [ssi=<service specific information (hexdump)>] This command maps to the Transmit() method in the NAN Discovery Engine. Following control interface events are used: NAN-DISCOVERY-RESULT subscribe_id=<own id> publish_id=<peer's id> address=<peer MAC address> fsd=<0/1> fsd_gas=<0/1> srv_proto_type=<type> ssi=<service specific information (hexdump)> This event maps to the DiscoveryResult() event in the NAN Discovery Engine. NAN-REPLIED publish_id=<own id> address=<peer MAC address> subscribe_id=<peer id> srv_proto_type=<ype> ssi=<service specific information (hexdump)> This event maps to the Replied() event in the NAN Discovery Engine. NAN-PUBLISH-TERMINATED publish_id=<own id> reason=<timeout/user-request/failure> This event maps to the PublishTerminated() event in the NAN Discovery Engine. NAN-SUBSCRIBE-TERMINATED subscribe_id=<own id> reason=<timeout/user-request/failure> This event maps to the SubscribeTerminate() event in the NAN Discovery Engine. NAN-RECEIVE id=<own id> peer_instance_id=<peer id> address=<peer MAC adress> ssi=<service specific information (hexdump)> This event maps to the Receive() event in the NAN Discovery Engine. Example operation ----------------- Start Subscribe and Publish functions: dev0: NAN_SUBSCRIBE service_name=_test srv_proto_type=3 ssi=1122334455 --> returns 7 dev1: NAN_PUBLISH service_name=_test srv_proto_type=3 ssi=6677 --> returns 5 Subscriber notification of a discovery: event on dev0: <3>NAN-DISCOVERY-RESULT subscribe_id=7 publish_id=5 address=02:00:00:00:01:00 fsd=1 fsd_gas=0 srv_proto_type=3 ssi=6677 Publisher notification of a Follow-up message with no ssi (to enter paused state to continue exchange with the subscriber): event on dev1: <3>NAN-RECEIVE id=5 peer_instance_id=7 address=02:00:00:00:00:00 ssi= Subscriber sending a Follow-up message: dev0: NAN_TRANSMIT handle=7 req_instance_id=5 address=02:00:00:00:01:00 ssi=8899 Publisher receiving the Follow-up message: event on dev1: <3>NAN-RECEIVE id=5 peer_instance_id=7 address=02:00:00:00:00:00 ssi=8899 Publisher sending a Follow-up message: dev1: NAN_TRANSMIT handle=5 req_instance_id=7 address=02:00:00:00:00:00 ssi=aabbccdd Subscriber receiving the Follow-up message: event on dev0: <3>NAN-RECEIVE id=7 peer_instance_id=5 address=02:00:00:00:01:00 ssi=aabbccdd Stop Subscribe and Publish functions: dev0: NAN_CANCEL_SUBSCRIBE subscribe_id=7 dev1: NAN_CANCEL_PUBLIST publish_id=5