1 Wi-Fi Aware unsynchronized service discovery (NAN USD) 2 ====================================================== 3 4 This document descibes how the unsynchronized service discovery defined 5 in the Wi-Fi Aware specification v4.0 can be used with wpa_spplicant. 6 7 More information about Wi-Fi Aware is available from this Wi-Fi 8 Alliance web page: 9 https://www.wi-fi.org/discover-wi-fi/wi-fi-aware 10 11 Build config setup 12 ------------------ 13 14 The following parameters must be included in the config file used to 15 compile hostapd and wpa_supplicant. 16 17 wpa_supplicant build config 18 --------------------------- 19 20 Enable NAN USD in wpa_supplicant build config file 21 22 CONFIG_NAN_USD=y 23 24 Control interface commands and events 25 ------------------------------------- 26 27 Following control interface commands can be used: 28 29 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] 30 31 If ttl=0 or the parameter is not included, only one Publish message is 32 transmitted. 33 34 If freq is not included, the default frequency 2437 MHz (channel 6 on 35 the 2.4 GHz band) is used. 36 37 If freq_list is included, publisher iterates over all the listed 38 channels. A special freq_list=all value can be used to generate the 39 channel list automatically based on the list of allowed 2.4 and 5 GHz 40 channels. 41 42 srv_proto_type values are defined in the Service Protocol Types table in 43 the Wi-Fi Aware specification. 44 45 This command returns the assigned publish_id value or FAIL on failure. 46 47 This command maps to the Publish() method in the NAN Discovery Engine. 48 49 NAN_CANCEL_PUBLISH publish_id=<id from NAN_PUBLISH> 50 51 This command maps to the CancelPublish() method in the NAN Discovery 52 Engine. 53 54 NAN_UPDATE_PUBLISH publish_id=<id from NAN_PUBLISH> [ssi=<service specific information (hexdump)>] 55 56 This command maps to the UpdatePublish() method in the NAN Discovery 57 Engine. 58 59 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)>] 60 61 If ttl=0 or the parameter is not included, operation is terminated once 62 the first matching publisher is found. 63 64 If freq is not included, the default frequency 2437 MHz (channel 6 on 65 the 2.4 GHz band) is used. 66 67 srv_proto_type values are defined in the Service Protocol Types table in 68 the Wi-Fi Aware specification. 69 70 This command returns the assigned subscribe_id value or FAIL on failure. 71 72 This command maps to the Subscribe() method in the NAN Discovery Engine. 73 74 NAN_CANCEL_SUBSCRIBE subscribe_id=<id from NAN_SUBSCRIBE> 75 76 This command maps to the CancelSubscribe() method in the NAN Discovery Engine. 77 78 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)>] 79 80 This command maps to the Transmit() method in the NAN Discovery Engine. 81 82 Following control interface events are used: 83 84 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)> 85 86 This event maps to the DiscoveryResult() event in the NAN Discovery 87 Engine. 88 89 NAN-REPLIED publish_id=<own id> address=<peer MAC address> subscribe_id=<peer id> srv_proto_type=<ype> ssi=<service specific information (hexdump)> 90 91 This event maps to the Replied() event in the NAN Discovery Engine. 92 93 NAN-PUBLISH-TERMINATED publish_id=<own id> reason=<timeout/user-request/failure> 94 95 This event maps to the PublishTerminated() event in the NAN Discovery 96 Engine. 97 98 NAN-SUBSCRIBE-TERMINATED subscribe_id=<own id> reason=<timeout/user-request/failure> 99 100 This event maps to the SubscribeTerminate() event in the NAN Discovery 101 Engine. 102 103 NAN-RECEIVE id=<own id> peer_instance_id=<peer id> address=<peer MAC adress> ssi=<service specific information (hexdump)> 104 105 This event maps to the Receive() event in the NAN Discovery Engine. 106 107 108 Example operation 109 ----------------- 110 111 Start Subscribe and Publish functions: 112 113 dev0: NAN_SUBSCRIBE service_name=_test srv_proto_type=3 ssi=1122334455 114 --> returns 7 115 116 dev1: NAN_PUBLISH service_name=_test srv_proto_type=3 ssi=6677 117 --> returns 5 118 119 Subscriber notification of a discovery: 120 121 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 122 123 Publisher notification of a Follow-up message with no ssi (to enter 124 paused state to continue exchange with the subscriber): 125 126 event on dev1: <3>NAN-RECEIVE id=5 peer_instance_id=7 address=02:00:00:00:00:00 ssi= 127 128 Subscriber sending a Follow-up message: 129 130 dev0: NAN_TRANSMIT handle=7 req_instance_id=5 address=02:00:00:00:01:00 ssi=8899 131 132 Publisher receiving the Follow-up message: 133 134 event on dev1: <3>NAN-RECEIVE id=5 peer_instance_id=7 address=02:00:00:00:00:00 ssi=8899 135 136 Publisher sending a Follow-up message: 137 138 dev1: NAN_TRANSMIT handle=5 req_instance_id=7 address=02:00:00:00:00:00 ssi=aabbccdd 139 140 Subscriber receiving the Follow-up message: 141 142 event on dev0: <3>NAN-RECEIVE id=7 peer_instance_id=5 address=02:00:00:00:01:00 ssi=aabbccdd 143 144 Stop Subscribe and Publish functions: 145 146 dev0: NAN_CANCEL_SUBSCRIBE subscribe_id=7 147 dev1: NAN_CANCEL_PUBLIST publish_id=5 148
Indexes created Sun Mar 01 05:31:48 UTC 2026