89 lines
2.6 KiB
Python
Executable File
89 lines
2.6 KiB
Python
Executable File
#!/usr/bin/env python3
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############################################################################
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# tools/discover.py
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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import array
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from socket import AF_INET, SO_BROADCAST, SOCK_DGRAM, SOL_SOCKET, socket, timeout
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PORT = 96
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DISCOVER_PROTO_ID = 0x99
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DISCOVER_ALL = 0xFF # 0xff means all devices
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DISCOVER_REQUEST = 0x01
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DISCOVER_RESPONSE = 0x02
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DISCOVER_REQUEST_SIZE = 4
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DISCOVER_RESPONSE_SIZE = 35
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def check_sum(data):
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chksum = 0
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for c in data[:-1]:
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chksum -= c
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return (chksum & 0xFF) == data[-1]
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def send_discover(socket):
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cmd = array.array("B", [0] * DISCOVER_REQUEST_SIZE)
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cmd[0] = DISCOVER_PROTO_ID # Tag for identification of the protocol
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cmd[1] = DISCOVER_REQUEST # Request command
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cmd[2] = DISCOVER_ALL
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chksum = 0
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for c in cmd[:3]:
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chksum -= c
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cmd[3] = chksum & 0xFF
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socket.sendto(cmd, ("<broadcast>", PORT))
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def read_responses(socket):
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res = []
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response = array.array("B", [0] * DISCOVER_RESPONSE_SIZE)
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try:
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while 1:
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size, src = socket.recvfrom_into(response)
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if (
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size == DISCOVER_RESPONSE_SIZE
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and response[0] == DISCOVER_PROTO_ID
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and response[1] == DISCOVER_RESPONSE
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and check_sum(response)
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):
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dev = {}
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dev["addr"] = src[0]
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dev["descr"] = response[2:-1].tostring().rstrip("\0")
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res.append(dev)
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except timeout:
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return res
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if __name__ == "__main__":
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print("Sending discover...")
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s = socket(AF_INET, SOCK_DGRAM)
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s.bind(("0.0.0.0", PORT))
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s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
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s.settimeout(1.0)
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send_discover(s)
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devices = read_responses(s)
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socket.close(s)
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print(devices)
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