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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2023 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
import json
from gnuradio import gr
import pmt
import websocket
class bme_ws_submitter(gr.basic_block):
"""
Submits telemetry to wss://gnd.bme.hu:8070/send
"""
def __init__(self):
gr.basic_block.__init__(
self,
name='bme_ws_submitter',
in_sig=[],
out_sig=[])
self.ws = websocket.WebSocket()
url = 'wss://gnd.bme.hu:8070/send'
try:
self.ws.connect(url)
except Exception:
print(f'could not connect to {url}; '
'disabling telemetry submission')
self.ws = None
self.message_port_register_in(pmt.intern('in'))
self.set_msg_handler(pmt.intern('in'), self.handle_msg)
def __del__(self):
if self.ws is not None:
self.ws.close()
def submit(self, frame):
if self.ws is None:
return
data = f'"data": "{frame.hex().upper()}"'
self.ws.send(data)
response = self.ws.recv()
response = json.loads('{' + response + '}')
error = any([v != 0 for k, v in response.items()
if 'error' in k])
if error:
print(f'server did not accept frame; returned: {response}')
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
frame = bytes(pmt.u8vector_elements(msg))
try:
self.submit(frame)
except Exception as e:
print(f'failed to submit frame: {e}')
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