MicroPython & Client-Server 使用Socket－史坦利Stanley程式Maker的部落格

Example1: (Station mode)
Python as Server SIde:

#!/usr/bin/python
prg_n = 'ServerSocketDemo-from-v29'
#
# This needs to be running on 'Server' BEFORE starting ESP8266 routine
#
import time; import socket; import os; import glob
port = 1247
i_cnt=0
#
# **** While True Loop ****
while True:
s = socket.socket()
host = socket.gethostname()
print host, port
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # added allow to reuse when re-run
s.bind(('',port)) # Needed (('',port)) or client never saw it
s.listen(5)
c, addr = s.accept()
# end of setting socket
#
print 'c, addr: ', c, addr
print 'Waiting for data from ESP8266...'
# it printed... c, addr: <socket._socketobject object at 0x7ff4d063c670> ('192.168.1.200', 3073)
print("Connection accepted from " + repr(addr[1]) + " Server ready for file transfer...\n")
# it printed... Connection accepted from xxxx Server ready for file transfer...
#
# ACK the client, get filename and open file for writes
starttime = time.time()    # measure start of ET to get and write file
c.send("ACK...\n")         # SEND MESSAGE TO CLIENT TO SEND DATA
#
tfile = "Server-WIP"
fobj = open(tfile, "w")
#
# Incoming Data, loop until "FILE-EOF", then repeat for additional file(s)
# get next line...
client_sent = c.recv(1026)
#
while client_sent != 'EOF\n' :
    print client_sent, # comma supresses a linefeed from printer (string already has a linefeed)
    fobj.write(client_sent)
    client_sent = c.recv(1026)
    #
######### HIT EOF\n
localtime = time.asctime( time.localtime(time.time()) )
print (localtime)
E_Time = (time.time() - starttime)
print "Elapsed Time: %.2f Seconds" % E_Time
fobj.write("Server:,,,,,Elapsed Time: %.2f Seconds" % E_Time + '\n' )
fobj.write("Server:,,,,,Program Name: %s " %prg_n + '\n' )
fobj.close()
os.chmod(tfile,0o666) # assign RW- to Owner, Group, Other
os.rename(tfile, tfile[0:18] + '-' + str(i_cnt))
i_cnt += 1
print ('addr[1]: '+repr(addr[1])+' FILE XFER DONE for: '+tfile[0:18]+'-'+ str(i_cnt))
#
### close the socket
### a new socket will be created for next upload;
### as the client closes its socket after uploads
###
print ('ALL FILES RCVD this session')
print ('close socket, open new socket and wait for next upload')
print ('Back to top level # "**** While True Loop ****"\nServer Prog: ' + prg_n)
s.close()

ESP8266 as Client (Station mode)

prg_n='ESP_SocketDemo.py'
#
# NOTE - Server socket must be up and running first
# This prog uploads the first file found in '/DATA' dir on the ESP8266
# Must first create '/DATA' and save a text file there
#
print(prg_n)
host='192.168.1.100';port=1247
my_ssid='ENTER-YOUR_SSID_HERE'
my_wifi_pw='ENTER_YOUR_NETWORK_PASSWORD_HERE'
#
import sys,time,utime,socket,network,machine
from ntptime import settime
from machine import Pin
#
uos.chdir('/DATA')# must be pre set up on ESP8266, add a text file demo here
#
# main code loop below, afer defs...
#
def set_WIFI(cntrl):
i=0;sta_if=network.WLAN(network.STA_IF)
if cntrl=='ON':
    if not sta_if.isconnected():
      print('conn WiFi')
      sta_if.active(True)
      sta_if.connect(my_ssid,my_wifi_pw)
      while not sta_if.isconnected():
        print(".",end="")
        time.sleep(1);i+=1
        if i>9:return#>>
else:sta_if.active(False)
print('NW CFG:',sta_if.ifconfig())
#
#
def upld_data():
sd=.3 # delay between sends - experiment with this
df='' # data file name
p16.high();red_LED=False
fl=uos.listdir()
df=fl[0]
print('fl: ',fl,'   dl: ',dl)
#
set_WIFI('ON')
s=socket.socket();time.sleep(sd)
try:
    s.connect((host,port))
except Exception as err:
    print('SockConn-ERR#: ',err)
    return('NOP')#>>
#
cmd=s.recv(1024)
if cmd.startswith('ACK'): # I have Server send 'ACK' on connect
    print('SRV-ACK')
else:#catch???
    print(cmd+' SRV-NO-ACK')
    s.close();return('NOP')#>>
#
print(df)
s.send(df);time.sleep(sd)
with open(df,'r') as fobj:
    for line in fobj: # will loop here until end-of-file
      print(line,end='')
      if red_LED == False:#toggle LED during sends
        p16.low();red_LED=True
      else:
        p16.high();red_LED=False
      s.send(line);time.sleep(sd)
p16.low();red_LED=True
#
# following is extra info I send after the file has been read
s.send('\nprg_n: '+prg_n+', Free MEM:,'+str(gc.mem_free())+'\n')
time.sleep(sd)
s.send('fl is: '+str(fl)+'\n')
time.sleep(sd)
fl=uos.statvfs('/')
fl='Tot/Used/Free %d blocks: %d/%d/%d\n' %(fl[0],fl[2],fl[2]-fl[3],fl[3])
print(fl)
s.send(fl);time.sleep(sd)
s.send('EOF\n') # Server will look for EOF message from ESP, finish,
                  # close/open its socket, loop back, wait for next upload
p16.high()
return('DONE')#>>
#
#END DEF
#
while True: # upload every 60 seconds
if utime.time() % 60 == 0:
    df_status = upld_data()
    print (df_status)
    time.sleep(1)
    gc.collect()
#
#

EXample2 : AP mode

ESP8266 As Http Server

import network

import socket

def log(msg):

    print(msg)

def do_connect():

    sta_if = network.WLAN(network.STA_IF)

    if not sta_if.isconnected():

        log('connecting to network...')

        sta_if.active(True)

        sta_if.connect('<SSID>', '<PASSWORD>')

        while not sta_if.isconnected():

            pass

    log('network config:'+str( sta_if.ifconfig()))

def start_myserver():

    log('start server method')

    addr = socket.getaddrinfo('192.168.0.1', 80)[0][-1]

    s = socket.socket()

    s.bind(addr)

    s.listen(1)

    log('listening on'+str( addr))

    while True:

        cl, addr = s.accept()

        log('client connected from'+str(addr))

        cl.send(html)

        cl.close()

#main part

html = """<!DOCTYPE html>

<html>

    <head> <title>ESP8266</title> </head>

    <body>

        Hello ESP8266 Server

    </body>

</html>

"""

do_connect()     # connect to your home router & get a ip address

start_myserver() # create server according the above get address

ESP8266 As TCP Server

#Start TCP server
import network

import socket
def do_connect():
ap_if = network.WLAN(network.AP_IF)
}

    addr = socket.getaddrinfo('192.168.0.121', 868)[0][-1]
    s = socket.socket()
    s.setblocking(False)
    s.bind(addr)
    s.listen(1)
    while True:
        start = time.ticks_ms()
        socket = (str)(s)
        if len(socket) > 43:
            cl, addr2 = s.accept()
            cl_str = (str)(cl)
            while cl_str[14] == "2":
                cl_str = (str)(cl)
            data = cl.recv(32)
            print(data)
            cl.close()
            delta = time.ticks_diff(time.ticks_ms(), start)
            print(delta)

下列測試 1 使用 ESP8266 AP 模式的固定 IP=192.168.4.1 當伺服端位址並綁定 80 埠監聽是否有客戶端連線進來, 有的話就回應 "Hello World" 網頁給遠端客戶.

測試 1 : 簡單的 HTTP 網頁伺服器

#main.py
import socket
addr=socket.getaddrinfo('192.168.4.1', 80)[0][-1]

s=socket.socket()
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) #設定 socket 位址可重複使用
s.bind(addr) #Server socket 綁定本身 AP 的網址與 80 埠
s.listen(5) #設定連線等候佇列最大連線數目為 5
print('listening on', addr)

html='<!DOCTYPE html><html><body>Hello!World</body></html>'

while True:
cs, addr=s.accept() #等候連線進來, 接受後傳回與該連線通訊之新 socket 與遠端位址
print('client connected from', addr) #輸出遠端網址
cs.send(html) #以網頁回應遠端客戶
cs.close() #關閉新 socket
s.close() #關閉 Server socket

將上面程式存成 main.py, 使用 ampy 上傳到 ESP8266 模組 :

D:\test>ampy --port COM4 put main.py

然後開啟 Putty 連線 ESP8266, 按 Ctrl+D 軟開機或插拔 ESP8266 電源重新執行 main.py, 由於進入無窮迴圈之故 REPL 介面最初會無反應.

分別使用筆電或手機以 WiFi 連線 ESP8266 的 AP 基地台 (SSID 是 MicroPython-xxxxxx, 其中 xxxxxx 是 MAC 位址後六碼, 而密碼預設是 micropythoN, 注意最後字元是大寫的 N),