==> beacon-bars.py <==
# 30 seconds schedule (300 deciseconds)
# First 15 seconds for ID.
# Tone bars at 15, 17, 19, 21, & 23 seconds.

import gpiozero
import os, sys, time

Ascii = 'VVV DE W6REK/B '

PowerSchedule = {
  142: '0.25',
  162: '0.10',
  182: '0.05',
  202: '0.02',
  222: '0.00',
  292: '0.25',
}

MORSE = {
  'V': '...-',
  'D': '-..',
  ' ': ' ',
  'W': '.--',
  '6': '-....',
  'R': '.-.',
  'E': '.',
  'K': '-.-',
  '/': '-..-.',
  'B': '-...',
  'C': '-.-.',
  'M': '--',
  '9': '----.',
  '7': '--...',
  'A': '.-',
  'H': '....',

  'G': '--.',
  'S': '...',
  'Z': '--..',
}

Morse = ' '.join(MORSE[ch] for ch in Ascii)
print >>sys.stderr, repr(Morse)

BEEPS = {
  '.': 'X',
  '-': 'XXX',
  ' ': '_',
}

Output = ' '.join(BEEPS[ch] for ch in Morse)
N = len(Output)
print >>sys.stderr, N, repr(Output)

Output = '%-150s' % Output
Output += 'XXXXXXXXXX'
Output += '~~~~~~~~~~'
Output += 'XXXXXXXXXX'
Output += '~~~~~~~~~~'
Output += 'XXXXXXXXXX'
Output += '~~~~~~~~~~'
Output += 'XXXXXXXXXX'
Output += '~~~~~~~~~~'
Output += 'XXXXXXXXXX'
Output += '~~~~~~~~~~'
N = len(Output)
print >>sys.stderr, N, repr(Output)

led = gpiozero.LED(17)
was = 0
print "pid %d" % os.getpid()
sys.stdout.flush()

while True:
  t = int(time.time() * 10.0)
  while t == int(time.time() * 10.0):
    pass
  k = (t + 1) % 300  # deciseconds, modulo 30 seconds.

  if k < N and Output[k] == 'X':
    led.off()  # Active low.
    if was:
      print "swr"
      sys.stdout.flush()
    was = 1
  else:
    led.on()   # Passive high.
    was = 0

  rfpower = PowerSchedule.get(k)
  if rfpower:
    print "power %s" % rfpower
    sys.stdout.flush()

pass  # NOT REACHED

==> beacon-slave.sh <==
#!/bin/bash

UART=$(echo /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_*)

function rig() {
  /usr/local/bin/rigctl -m "361" -s 9600 -r $UART "$@"
}

trap 'rig T 0; sleep 0.3; rig T 0; exit' 0 1 2 3

rig T 0
rig F 28214300
rig M CW 250
rig L KEYSPD 12
rig L RFPOWER 0.01
rig T 1

while :
do
  read cmd arg junk
  case $cmd in
    pid)
      MASTER="$arg"
      ;;
    power)
      rig L RFPOWER "$arg"
      echo RFPOWER "$arg"
      date -u "+%Y-%m-%d %H:%M:%S Z"
      ;;
    swr)
      s=$(rig l SWR)
      echo SWR $s
      case $s in
        1.[012]* )
	  : ok
	  ;;
	* )
	  kill $MASTER
	  sleep 1
	  kill $MASTER
	  exit
          ;;
      esac
      ;;
    *)
      kill $MASTER
      sleep 1
      kill $MASTER
      exit
      ;;
  esac
done

==> run.sh <==
#!/bin/bash

export PATH="/usr/local/bin:$PATH"
taskset 8 python beacon-bars.py | taskset 4 bash beacon-slave.sh