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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2025 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
import threading
import pmt
from gnuradio import gr
import zmq
class csp_zmq_sub(gr.sync_block):
"""CSP ZMQ SUB block"""
def __init__(self, address, destinations):
gr.sync_block.__init__(
self,
name='csp_zmq_sub',
in_sig=[],
out_sig=[]
)
ctx = zmq.Context()
self.socket = ctx.socket(zmq.SUB)
self.socket.connect(address)
for dest in destinations:
self.socket.setsockopt(zmq.SUBSCRIBE, bytes([dest]))
self.message_port_register_out(pmt.intern('out'))
self.run_thread = threading.Thread(target=self.run, daemon=True)
self.run_thread.start()
def run(self):
while True:
msg = self.socket.recv()
if len(msg) < 5:
print('[csp_zmq_sub] message too short; dropping')
# strip out destination
msg = msg[1:]
# byte-swap CSP header, since CSP ZMQ uses CSP headers in opposite
# endianness compared to over-the-air
msg = msg[:4][::-1] + msg[4:]
msg = pmt.cons(pmt.PMT_NIL,
pmt.init_u8vector(len(msg), list(msg)))
self.message_port_pub(pmt.intern('out'), msg)
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