Reorganized things quite a bit. Much cleaner output interface.

Made a single registry of output plugins which gets populated on init with classes to output on a socket, print to screen, database, etc. Next step is to implement a SQLite database class.

src/python/modes_sbs1.py

@@ -0,0 +1,96 @@
+import time, os, sys, socket
+from string import split, join
+import modes_parse
+from datetime import *
+
+class modes_output_sbs1(modes_parse.modes_parse):
+  def __init__(self):
+    self._s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    self._s.bind(('', 30003))
+    self._s.listen(1)
+    self._s.setblocking(0) #nonblocking
+    self._conns = [] #list of active connections
+    
+  def output(self, msg):
+    sbs1_msg = self.parse(msg)
+    if sbs1_msg is not None:
+      for conn in self._conns[:]: #iterate over a copy of the list
+        try:
+          conn.send(sbs1_msg)
+        except socket.error:
+          self._conns.remove(conn)
+          print "Connections: ", len(self._conns)
+
+  def add_pending_conns(self):
+    try:
+      conn, addr = self._s.accept()
+      self._conns.append(conn)
+      print "Connections: ", len(self._conns)
+    except socket.error:
+      pass
+
+  def __del__(self):
+    self._s.close()
+            
+  def parse(self, message):
+    #assembles a SBS-1-style output string from the received message
+    #this version ignores anything that isn't Type 17 for now, because we just don't care
+
+    [msgtype, shortdata, longdata, parity, ecc, reference] = message.split()
+
+    shortdata = long(shortdata, 16)
+    longdata = long(longdata, 16)
+    parity = long(parity, 16)
+    ecc = long(ecc, 16)
+#	reference = float(reference)
+
+    msgtype = int(msgtype)
+
+    outmsg = None
+
+    if msgtype == 17:
+        outmsg = self.pp17(shortdata, longdata, parity, ecc)
+
+    return outmsg
+
+  def pp17(self, shortdata, longdata, parity, ecc):
+    icao24 = shortdata & 0xFFFFFF	
+    subtype = (longdata >> 51) & 0x1F
+
+    retstr = None
+    timenow = datetime.now()
+    datestr = timenow.strftime("%Y/%m/%d")
+    timestr = timenow.strftime("%H:%M:%S.000") #we'll get better timestamps later, hopefully with actual VRT time in them
+
+    if subtype == 4:
+      msg = self.parseBDS08(shortdata, longdata, parity, ecc)
+      retstr = "MSG,1,0,0,%X,0,%s,%s,%s,%s,%s,,,,,,,,,,,\n" % (icao24, datestr, timestr, datestr, timestr, msg)
+
+    elif subtype >= 5 and subtype <= 8:
+      [altitude, decoded_lat, decoded_lon, rnge, bearing] = self.parseBDS06(shortdata, longdata, parity, ecc)
+      if decoded_lat is None: #no unambiguously valid position available
+        retstr = None
+      else:
+        retstr = "MSG,3,0,0,%X,0,%s,%s,%s,%s,,%i,,,%.5f,%.5f,,,,0,0,0\n" % (icao24, datestr, timestr, datestr, timestr, altitude, decoded_lat, decoded_lon)
+
+    elif subtype >= 9 and subtype <= 18 and subtype != 15: #i'm eliminating type 15 records because they don't appear to be valid position reports.
+      [altitude, decoded_lat, decoded_lon, rnge, bearing] = self.parseBDS05(shortdata, longdata, parity, ecc)
+      if decoded_lat is None: #no unambiguously valid position available
+        retstr = None
+      else:
+        retstr = "MSG,3,0,0,%X,0,%s,%s,%s,%s,,%i,,,%.5f,%.5f,,,,0,0,0\n" % (icao24, datestr, timestr, datestr, timestr, altitude, decoded_lat, decoded_lon)
+
+    elif subtype == 19:
+      subsubtype = (longdata >> 48) & 0x07
+      if subsubtype == 0:
+        [velocity, heading, vert_spd] = self.parseBDS09_0(shortdata, longdata, parity, ecc)
+        retstr = "MSG,4,0,0,%X,0,%s,%s,%s,%s,,,%.1f,%.1f,,,%i,,,,,\n" % (icao24, datestr, timestr, datestr, timestr, velocity, heading, vert_spd)
+
+      elif subsubtype == 1:
+        [velocity, heading, vert_spd] = self.parseBDS09_1(shortdata, longdata, parity, ecc)
+        retstr = "MSG,4,0,0,%X,0,%s,%s,%s,%s,,,%.1f,%.1f,,,%i,,,,,\n" % (icao24, datestr, timestr, datestr, timestr, velocity, heading, vert_spd)
+
+    #else:
+      #print "debug (modes_sbs1): unknown subtype %i with data %x %x %x\n" % (subtype, shortdata, longdata, parity,)
+
+    return retstr