boot.py

import sys

def is_legal_wifi(essid, password):
    '''
    判断WIFI密码是否合法
    '''
    if len(essid) == 0 or len(password) == 0:
        return False
    return True

def do_connect():
    import json
    import network
    # 尝试读取配置文件wifi_confi.json,这里我们以json的方式来存储WIFI配置
    # wifi_config.json在根目录下

    # 若不是初次运行,则将文件中的内容读取并加载到字典变量 config
    try:
        with open('wifi_config.json','r') as f:
            config = json.loads(f.read())
    # 若初次运行,则将进入excpet,执行配置文件的创建       
    except:
        essid = ''
        password = ''

        while True:
            essid = input('wifi name:') # 输入essid
            password = input('wifi passwrod:') # 输入password

            if is_legal_wifi(essid, password):
                config = dict(essid=essid, password=password) # 创建字典
                with open('wifi_config.json','w') as f:
                    f.write(json.dumps(config)) # 将字典序列化为json字符串,存入wifi_config.json
                break
            else:
                print('ERROR, Please Input Right WIFI')

    #以下为正常的WIFI连接流程       
    wifi = network.WLAN(network.STA_IF) 
    if not wifi.isconnected():
        print('connecting to network...')
        wifi.active(True)
        wifi.connect(config['essid'], config['password'])
        import utime

        for i in range(200):
            print('第{}次尝试连接WIFI热点'.format(i))
            if wifi.isconnected():
                break
            utime.sleep_ms(100) #一般睡个5-10秒,应该绰绰有余

        if not wifi.isconnected():
            wifi.active(False) #关掉连接,免得repl死循环输出
            print('wifi connection error, please reconnect')
            import os
            # 连续输错essid和password会导致wifi_config.json不存在
            try:
                os.remove('wifi_config.json') # 删除配置文件
            except:
                pass
            do_connect() # 重新连接
        else:
            print('network config:', wifi.ifconfig())
    
if __name__ == '__main__':
    do_connect()