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wifi: berlin prime bunny hopping

- reduce delay for channel hop to 200ms
- use 1000ms timeout for auth response (dont hop channels while we wait)
- bunny hop sequence is mathematically prooven

--- a/sys/src/9/pc/wifi.c

+++ b/sys/src/9/pc/wifi.c

@@ -533,6 +533,7 @@

 			&& goodbss(wifi, wn)){

 				setstatus(wifi, wn, Sconn);

 				sendauth(wifi, wn);

+				wifi->lastauth = wn->lastsend;

 			}

 			continue;

 		}

@@ -664,9 +665,12 @@

 	/* scan for access point */

 	while(wifi->bss == nil){

 		ether->link = 0;

-		wnscan.channel = 1 + wnscan.channel % 11;

+		wnscan.channel = 1 + ((wnscan.channel+4) % 13);

 		wifiprobe(wifi, &wnscan);

-		tsleep(&up->sleep, return0, 0, 1000);

+		do {

+			tsleep(&up->sleep, return0, 0, 200);

+			now = MACHP(0)->ticks;

+		} while(TK2MS(now-wifi->lastauth) < 1000);

 	}

 	/* maintain access point */

@@ -715,6 +719,8 @@

 	wifi->essid[0] = 0;

 	memmove(wifi->bssid, ether->bcast, Eaddrlen);

+

+	wifi->lastauth = MACHP(0)->ticks;

 	snprint(name, sizeof(name), "#l%dwifi", ether->ctlrno);

 	kproc(name, wifiproc, wifi);

--- a/sys/src/9/pc/wifi.h

+++ b/sys/src/9/pc/wifi.h

@@ -56,6 +56,7 @@

 	Queue	*iq;

 	ulong	watchdog;

+	ulong	lastauth;

 	Ref	txseq;

 	void	(*transmit)(Wifi*, Wnode*, Block*);