動作環境

GeForce GTX 1070 (8GB)
ASRock Z170M Pro4S [Intel Z170chipset]
Ubuntu 16.04 LTS desktop amd64
TensorFlow v1.2.1
cuDNN v5.1 for Linux
CUDA v8.0
Python 3.5.2
IPython 6.0.0 -- An enhanced Interactive Python.
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
GNU bash, version 4.3.48(1)-release (x86_64-pc-linux-gnu)
scipy v0.19.1
geopandas v0.3.0
MATLAB R2017b (Home Edition)
ADDA v.1.3b6
PyQt5 v5.5.1

プロジェクト開始: https://qiita.com/7of9/items/4077c92b9a773e054193

処理概要

UDP (ポート7000)で受信
受信した文字をそのままエコーバックする

参考

code v0.1 > Multicast版?

udp_echoserver_180119.py

import PyQt5.QtNetwork as qtn

'''
v0.1 Jan. 19, 2018
  - echo back
'''

UDP_PORT = 7000

groupaddr = qtn.QHostAddress("192.168.0.1") 
udp = qtn.QUdpSocket()
udp.setSocketOption(qtn.QAbstractSocket.MulticastLoopbackOption,1)
udp.setSocketOption(qtn.QAbstractSocket.MulticastTtlOption,32)
udp.bind(qtn.QHostAddress.AnyIPv4,UDP_PORT,qtn.QUdpSocket.ShareAddress)
ni = qtn.QNetworkInterface()
udp.joinMulticastGroup(groupaddr,ni)

while True:
    if udp.hasPendingDatagrams():
        data,host,port = udp.readDatagram(udp.pendingDatagramSize())
        udp.writeDatagram(data, host, port)
        print(data)
        print(host)
        
udp.leaveMulticastGroup(groupaddr)
udp.close()

実行

受信側はUbuntu 16.04 LTSで、送信側はRaspberry Piとしている。

run(Ubuntu)

$ python3 udp_echoserver_180119.py 
b'test\n'
<PyQt5.QtNetwork.QHostAddress object at 0x7f4143108908>
b'test\n'
<PyQt5.QtNetwork.QHostAddress object at 0x7f4143108978>
...

run(RPi)

pi@raspberrypi ~ $ echo "test" | nc -u 192.168.0.9 7000
test
^C
pi@raspberrypi ~ $ echo "test" | nc -u 192.168.0.9 7000
test
^C
...

code v0.2 > non-Multicast版

udp_echoserver_180119.py

import PyQt5.QtNetwork as qtn

'''
v0.2 Jan. 19, 2018
  - remove multicast feature
v0.1 Jan. 19, 2018
  - echo back
'''

UDP_PORT = 7000

udp = qtn.QUdpSocket()
udp.bind(UDP_PORT)

while True:
    if udp.hasPendingDatagrams():
        data,host,port = udp.readDatagram(udp.pendingDatagramSize())
        udp.writeDatagram(data, host, port)
        print(data.decode("utf-8"))
        print(host)

udp.close()