def TXRSH(self, fsm):
"""TXRSH state; overloaded to send RSH prior to DATA."""
assert DCF.isdot11data(self, self.datatosend), \
"[RBAR]: Cannot determine 'datatosend' in TXUCAST!"
assert not (self.datatosend.addr1==self.broadcast), \
"[RBAR]: Cannot send broadcast 'datatosend' in TXUCAST!"
# update rate annotation
data = self.get_dot11data(self.datatosend)
dst, src = data.addr1, data.addr2
rate = self.ra.get_rate(dst)
data.setanno('phy-rate', rate)
if not self.usecsma:
# send RSH before sending DATA
rsh = self.dot11rsh(addr1=dst, addr2=src)
self.send_rsh(rsh, self.datatosend)
# recalculate NAV from new rate information
nav = self.rshnav(self.datatosend)
rsh.ID = nav
pkt = crcupdate(rsh)
# send and hold for duration
rate, length = pkt[RAI].rate, pkt[RAI].length
self.log("RSH", pkt, nav=nav, rate=rate, length=length)
duration = self.duration(pkt)
self.log_send(pkt, nav=nav)
yield self.TXD.send(fsm, [pkt])
yield hold, fsm, duration
# pause for SIFS before continuing
yield hold, fsm, self.sifs
# go to DCF.TXUCAST state
OLDSTATE = lambda *args, **kwargs: DCF.TXUCAST(self, *args, **kwargs)
yield fsm.goto(OLDSTATE)
def isdot11data(self, p):
"""Overloaded to check for DATA or RSH."""
isdata = DCF.isdot11data(self, p)
isrsh = self.isdot11rsh(p)
return (isdata or isrsh)
