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2021/1/3
初版

MicroPython(F767ZI ) Network Samples

概要

MicroPython(F767ZI) Network Samples

この記事は「 MicroPython(F767ZI)でStartwars(AsciiArt)を動かす」の続編にあたり、NetworkアクセスSamplesを記述している。ネットワークの接続が完了すれば、それ以降はESP8266のmicropythonとほぼ同じようだ。
(ホストはubuntuを想定している)

sample1

http_get.py

# ネットワークを有効化する
import network
nic = network.LAN()
nic.active(1)

# 以下はESP8266のサンプルと全く同じ

def http_get(url):
    import socket
    _, _, host, path = url.split('/', 3)
    addr = socket.getaddrinfo(host, 80)[0][-1]
    s = socket.socket()
    s.connect(addr)
    s.send(bytes('GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n' % (path, host), 'utf8'))
    while True:
        data = s.recv(100)
        if data:
            print(str(data, 'utf8'), end='')
        else:
            break
    s.close()

print(http_get('http://micropython.org/ks/test.html'))

REPL実行例：

paste mode; Ctrl-C to cancel, Ctrl-D to finish
=== import network
=== nic = network.LAN()
=== nic.active(1)
=== 
=== 
>>> nic.ifconfig()
('192.168.0.18', '255.255.255.0', '192.168.0.4', '192.168.0.4')
>>> 
paste mode; Ctrl-C to cancel, Ctrl-D to finish
=== 
=== def http_get(url):
===     import socket
===     _, _, host, path = url.split('/', 3)
===     addr = socket.getaddrinfo(host, 80)[0][-1]
===     s = socket.socket()
===     s.connect(addr)
===     s.send(bytes('GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n' % (path, host), 'utf8'))
===     while True:
===         data = s.recv(100)
===         if data:
===             print(str(data, 'utf8'), end='')
===         else:
===             break
===     s.close()
=== 
=== print(http_get('http://micropython.org/ks/test.html'))
=== 
=== 

REPL出力結果：

HTTP/1.1 200 OK
Server: nginx/1.10.3
Date: Sun, 03 Jan 2021 09:54:59 GMT
Content-Type: text/html
Content-Length: 180
Last-Modified: Tue, 03 Dec 2013 00:16:26 GMT
Connection: close
Vary: Accept-Encoding
ETag: "529d22da-b4"
Accept-Ranges: bytes

<!DOCTYPE html>
<html lang="en">
    <head>
        <title>Test</title>
    </head>
    <body>
        <h1>Test</h1>
        It's working if you can read this!
    </body>
</html>
None

sample2

目的のプログラム実行前に
以下を実行してネットワークの有効化と
IPアドレスの確認を行なう。

import network
nic = network.LAN()
nic.active(1)

nic.ifconfig()

httpserver.py

# 以下はESP8266のサンプルを差分のあるmachine関係をコメントアウトしたもの

#import machine
#pins = [machine.Pin(i, machine.Pin.IN) for i in (0, 2, 4, 5, 12, 13, 14, 15)]

html = """<!DOCTYPE html>
<html>
    <head> <title>ESP8266 Pins</title> </head>
    <body> <h1>ESP8266 Pins</h1>
        <table border="1"> <tr><th>Pin</th><th>Value</th></tr> %s </table>
    </body>
</html>
"""

import socket
addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]

s = socket.socket()
s.bind(addr)
s.listen(1)

print('listening on', addr)

while True:
    cl, addr = s.accept()
    print('client connected from', addr)
    cl_file = cl.makefile('rwb', 0)
    while True:
        line = cl_file.readline()
        if not line or line == b'\r\n':
            break

#rows = ['<tr><td>%s</td><td>%d</td></tr>' % (str(p), p.value()) for p in pins]
    rows = ['<tr><td>ABC</td><td>123</td></tr>']
    response = html % '\n'.join(rows)
    cl.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
    cl.send(response)
    cl.close()

REPL実行例：

>>> nic.active()
True
>>> nic.ifconfig()
('192.168.0.18', '255.255.255.0', '192.168.0.4', '192.168.0.4')
>>> 
# 上の192.168.0.18がサーバーアドレスになるので覚えておいてサーバー起動後、このIPアドレスにアクセスする

paste mode; Ctrl-C to cancel, Ctrl-D to finish
=== #import machine
=== #pins = [machine.Pin(i, machine.Pin.IN) for i in (0, 2, 4, 5, 12, 13, 14, 15)]
=== 
=== html = """<!DOCTYPE html>
=== <html>
===     <head> <title>ESP8266 Pins</title> </head>
===     <body> <h1>ESP8266 Pins</h1>
===         <table border="1"> <tr><th>Pin</th><th>Value</th></tr> %s </table>
===     </body>
=== </html>
=== """
=== 
=== import socket
=== addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
=== 
=== s = socket.socket()
=== s.bind(addr)
=== s.listen(1)
=== 
=== print('listening on', addr)
=== 
=== while True:
===     cl, addr = s.accept()
===     print('client connected from', addr)
===     cl_file = cl.makefile('rwb', 0)
===     while True:
===         line = cl_file.readline()
===         if not line or line == b'\r\n':
===             break
=== 
=== #rows = ['<tr><td>%s</td><td>%d</td></tr>' % (str(p), p.value()) for p in pins]
===     rows = ['<tr><td>ABC</td><td>123</td></tr>']
===     response = html % '\n'.join(rows)
===     cl.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
===     cl.send(response)
===     cl.close()
=== 
=== 

上でサーバーを起動したら確認したIPアドレス(192.128.0.xxx:80)でブラウザー・アクセスする。

REPL出力例：

listening on ('0.0.0.0', 80)
client connected from ('192.168.0.2', 56016)
44
229
client connected from ('192.168.0.2', 56018)
44
229

ウェブ画面表示例：

ESP8266 Pins

Pin	Value
ABC	123

参考情報

https://docs.micropython.org/en/latest/esp8266/tutorial/network_basics.html
https://docs.micropython.org/en/latest/esp8266/tutorial/network_tcp.html

・M5Stack MicroPython API調査記録　ネットワーク編
・ESP32/ESP8266のMicroPythonでMQTTを使ってみた
・ESP32のMicroPythonでOSC(Open Sound Control)で通信する

以上