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#
# Copyright 2017 Ettus Research (National Instruments)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""
Code to run the discovery port
"""
from __future__ import print_function
import time
import ctypes
from multiprocessing import Process, Value
from six import iteritems
import socket
from types import MPM_DISCOVERY_PORT, graceful_exit
RESPONSE_PREAMBLE = "USRP-MPM"
RESPONSE_SEP = ";"
RESPONSE_CLAIMED_KEY = "claimed"
def spawn_discovery_process(device_info, shared_state):
"""
Returns a process that contains the device discovery.
Arguments:
device_info -- A dictionary of type string -> string. All of these items
will be included in the response string.
"""
# claim_status = Value(ctypes.c_bool, False)
p = Process(target=_discovery_process, args=(device_info, shared_state))
p.start()
return p
def _discovery_process(device_info, state):
"""
The actual process for device discovery. Is spawned by
spawn_discovery_process().
"""
def create_response_string():
" Generate the string that gets sent back to the requester. "
return RESPONSE_SEP.join(
[RESPONSE_PREAMBLE] + \
["{k}={v}".format(k=k, v=v) for k, v in iteritems(device_info)] + \
["{k}={v}".format(k=RESPONSE_CLAIMED_KEY, v=state.claim_status.value)] + \
["{k}={v}".format(k="token", v=state.claim_token.value)]
)
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind((("0.0.0.0", MPM_DISCOVERY_PORT)))
send_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
while True:
data, sender = sock.recvfrom(4096)
if data.strip("\0") == "MPM-DISC":
send_data = create_response_string()
send_sock.sendto(send_data, sender)
except:
sock.close()
send_sock.close()
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