kopia lustrzana https://github.com/DL7AD/pecanpico9
126 wiersze
3.9 KiB
Python
126 wiersze
3.9 KiB
Python
import binascii
|
|
import urllib.request
|
|
import urllib.error
|
|
import datetime
|
|
from position import decode_position
|
|
from subprocess import *
|
|
|
|
jsons = []
|
|
|
|
def decode_callsign(code):
|
|
callsign = ''
|
|
|
|
while code > 0:
|
|
s = code % 40
|
|
if s == 0: callsign += '-'
|
|
elif s < 11: callsign += chr(47 + s)
|
|
elif s < 14: callsign += '-'
|
|
else: callsign += chr(51 + s)
|
|
code /= 40
|
|
|
|
return callsign
|
|
|
|
def encode_callsign(callsign):
|
|
x = 0
|
|
for i in range(len(callsign)-1,-1,-1):
|
|
x *= 40
|
|
c = ord(callsign[i])
|
|
if c >= 65 and c <= 90: x += c - 51
|
|
elif c >= 97 and c <= 122: x += c - 83
|
|
elif c >= 48 and c <= 57: x += c - 47
|
|
|
|
return x
|
|
|
|
"""
|
|
Decodes an APRS/SSDV image packet (APRS header must be removed already)
|
|
sqlite - Database handle
|
|
reciever - The call of the receiving station
|
|
call - The call of the transmitter
|
|
data - Binary data
|
|
"""
|
|
def insert_image(sqlite, receiver, call, tim, posi, data, server, grouping):
|
|
global jsons
|
|
|
|
if len(data) != 214:
|
|
return # APRS message sampled too short
|
|
|
|
# Encode callsign (ensure callsign has no more than 6 chars)
|
|
bcall = call.split('-') # Split callsign and SSID
|
|
if len(bcall) == 1: # No SSID available, so take the callsign
|
|
bcall = bcall[0][0:6]
|
|
elif(len(bcall[0]) < 5): # Callsign has 4 chars, so take it with the SSID
|
|
bcall = bcall[0] + bcall[1][0:2]
|
|
elif(len(bcall[0]) < 6): # Callsign has 5 chars, so take it with the last digit of the SSID
|
|
bcall = bcall[0] + bcall[1][-1]
|
|
else:
|
|
bcall = bcall[0][0:6] # Callsign has 6 chars, so take the call without SSID
|
|
|
|
data = binascii.unhexlify('66%08x' % encode_callsign(bcall)) + data
|
|
|
|
# Calculate CRC for SSDV server
|
|
crc = binascii.crc32(data) & 0xffffffff
|
|
|
|
# Create message for SSDV server (and save to array)
|
|
ssdv = '55' + binascii.hexlify(data).decode("ascii") + ('%08x' % crc) + (64*'0')
|
|
jsons.append("""{
|
|
\"type\": \"packet\",
|
|
\"packet\": \"""" + ssdv + """\",
|
|
\"encoding\": \"hex\",
|
|
\"received\": \"""" + datetime.datetime.now().isoformat('T')[:19] + """Z\",
|
|
\"receiver\": \"""" + receiver + """\"
|
|
}""")
|
|
|
|
# Decode various meta data
|
|
timd,x,y,z,dummy = decode_position(tim, posi, None)
|
|
imageID = data[5]
|
|
packetID = (data[6] << 8) | data[7]
|
|
|
|
# Debug
|
|
print('Received packet from %s image %d packet %d' % (call, imageID, packetID))
|
|
|
|
# Insert
|
|
sqlite.cursor().execute("""
|
|
INSERT OR REPLACE INTO image (call,time,imageID,packetID,lat,lon,alt,data)
|
|
VALUES (?,?,?,?,?,?,?,?)""",
|
|
(call, int(timd.timestamp()), imageID, packetID, y, x, int(z), ssdv)
|
|
)
|
|
sqlite.commit()
|
|
|
|
# SSDV decode
|
|
cur = sqlite.cursor()
|
|
cur.execute("SELECT GROUP_CONCAT(data,'') FROM image WHERE call = ? AND imageID = ? AND time = ? GROUP BY imageID ORDER BY packetID", (call, imageID, int(timd.timestamp())))
|
|
name = 'html/images/%s-%d-%d.jpg' % (call.replace('-',''), int(timd.timestamp()), imageID)
|
|
f = open(name, 'wb')
|
|
process = Popen(['./ssdv', '-d'], stdin=PIPE, stdout=f, stderr=PIPE)
|
|
process.stdin.write(binascii.unhexlify(cur.fetchall()[0][0]))
|
|
dummy,err = process.communicate()
|
|
f.close()
|
|
|
|
if len(jsons) >= grouping: # Enough packets collected, send them all to the server
|
|
|
|
req = urllib.request.Request(server)
|
|
req.add_header('Content-Type', 'application/json')
|
|
|
|
json = "{\"type\":\"packets\",\"packets\":[" + ",".join(jsons) + "]}" # Group all SSDV packets into a big JSON
|
|
jsons = []
|
|
|
|
try:
|
|
error = True
|
|
while error:
|
|
print('Send to SSDV data server')
|
|
try:
|
|
result = urllib.request.urlopen(req, "".join(json.split(' ')).encode("ascii")) # Send packets to server
|
|
print('Response from Server: OK')
|
|
error = False
|
|
except urllib.error.URLError as error:
|
|
if error.code == 400:
|
|
print('Response from Server: %s', error.read())
|
|
error = False
|
|
else:
|
|
print('SSDV-Server connection error... try again')
|
|
|
|
except urllib.error.HTTPError as error: # The server did not like our packets :(
|
|
print('Send to SSDV data server: failed (the server did not like our packets :( )')
|
|
print(error.read())
|
|
|