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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 pmt
from gnuradio import gr
import zmq
class csp_zmq_pub(gr.sync_block):
"""CSP ZMQ PUB block"""
def __init__(self, address):
gr.sync_block.__init__(
self,
name='csp_zmq_pub',
in_sig=[],
out_sig=[]
)
ctx = zmq.Context()
self.socket = ctx.socket(zmq.PUB)
self.socket.connect(address)
self.message_port_register_in(pmt.intern('in'))
self.set_msg_handler(pmt.intern('in'), self.handle_msg)
def handle_msg(self, msg_pmt):
msg = pmt.cdr(msg_pmt)
if not pmt.is_u8vector(msg):
print('[ERROR] received invalid message type. Expected u8vector')
return
msg = bytes(pmt.u8vector_elements(msg))
if len(msg) < 4:
print('[csp_zmq_pub] message too short; dropping')
csp_header = msg[:4]
payload = msg[4:]
# extract destination from CSP header
dest = ((csp_header[0] & 1) << 4) | (csp_header[1] >> 4)
# byte-swap csp_header, since CSP ZMQ uses headers in the opposite
# endianness compared to over-the-air
self.socket.send(bytes([dest]) + csp_header[::-1] + payload)
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