Novra S300N Status Monitor

mon300.py

#!/awips2/python/bin/python

# This software is released into the public domain.
# If your jurisdiction does not recognize works
# released into the public domain, then this work
# is freely available to anyone for any reason, 
# even if the original author finds that use
# morally abhorrent.  

import s300
import sys
import time

n = s300.Novra()

while True:
        sys.stdout.write("\x1B[2J\x1B[H")
        _, _, _, _, freq, _, csr,lsr,isi,sig,cnr,addr = n.get_status()
        print "CSR  . . . :", csr
        print "LSR  . . . :", lsr
        print "Signal . . :", sig
        print "C/N  . . . :", cnr
        print time.ctime()
        print addr

s300.py

# This software is released into the public domain.
# If your jurisdiction does not recognize works
# released into the public domain, then this work
# is freely available to anyone for any reason, 
# even if the original author finds that use
# morally abhorrent.  

import socket
import struct
import time
import numpy
import sys

class Novra:

        HOST = '0.0.0.0'
        PORT = 6516

        def __init__(self):
                s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
                s.bind((self.HOST, self.PORT))
                self.sock = s

        def get_status(self):
                data, addr = self.get_packet()
                mac = "%02X:%02X:%02X:%02X:%02X:%02X" % struct.unpack('BBBBBB', data[4:10])
                ip  = "%d.%d.%d.%d" % struct.unpack('BBBB', data[10:14])
                nm  = "%d.%d.%d.%d" % struct.unpack('BBBB', data[14:18])
                # wtf 9 and 10
                # unicast status address 
                usa = "%d.%d.%d.%d" % struct.unpack('BBBB', data[22:26]) 
                usp = struct.unpack('>H', data[26:28])[0]
                bsp = struct.unpack('>H', data[28:30])[0]
                freq = struct.unpack('>H', data[30:32])[0]
                ferr = struct.unpack('>f', data[54:58])[0]
                csr = struct.unpack('>H', data[36:38])[0]
                isi = struct.unpack('>H', data[44:46])[0]
                lsr = struct.unpack('>H', data[58:60])[0]
                sig = struct.unpack('>h', data[78:80])[0]
                cnr = float(struct.unpack('>H', data[80:82])[0]) / 10.0
                return (mac, (ip, nm), (usa, usp), bsp, freq, ferr, csr,lsr,isi,sig,cnr, addr)

        def get_packet(self):
                s = self.sock
                return s.recvfrom(512) # packets are 130 bytes long