本文共 2629 字，大约阅读时间需要 8 分钟。

序言 ：

FTP(File Transfer Protocol)是一种文件传输协议，一般是为了方便数据共享的;包括一个FTP服务器和多个FTP客户端，下面我们来一场FTP之旅：

准备工作

工作流程

配置阿里云FTP服务器

• 购买服务器，个人推荐 

• ，这里用到的镜像是Alyun Linux 2.19.03 

•  在轻量应用型服务器管理控制台->安全->防火墙->添加规则 

• 获取用户名和密码

bt default

• 浏览器输入ip:8888->输入获取到的用户名和密码->登录宝塔面板 
• 安全->开放端口->1-65535 

• FTP->添加FTP->填上用户名和密码 
• 鼠标左击根目录->进入 

SIM820X FTPS 通信

关键指令分析

• start FTP service

AT+CFTPSSTART

• set data connection use the sameaddress of control connection

AT+CFTPSSINGLEIP=1

• login to a FTP server

AT+CFTPSLOGIN="120.79.2.0",21,"aly","root",0

• list all items of directory “/”

AT+CFTPSLIST="/"

• change current directory to "F:/"

AT+FSCD=F:/

• list all items in "F:/"

AT+FSLS

• upload file from"F:/" to FTP serve

AT+CFTPSPUTFILE="Code_204_NOK.qmdl"

• download file from"F:/" to FTP serve

AT+CFTPSGETFILE="tower.png"

在电脑测试

下载文件到串口/从串口上传文件

在树莓派测试

示例程序

#!/usr/bin/pythonimport serialimport timeser = serial.Serial("/dev/ttyUSB3",115200)ser.flushInput()rec_buff = ''ftp_user_name = 'aly'ftp_user_password = 'root'ftp_server = '120.79.2.0'download_file_name = 'hello.py'upload_file_name = 'hello.py'def send_at(command,back,timeout):	rec_buff = ''	ser.write((command+'\r\n').encode())	time.sleep(timeout)	if ser.inWaiting():		time.sleep(0.1 )		rec_buff = ser.read(ser.inWaiting())	if rec_buff != '':		if back not in rec_buff.decode():			print(command + ' ERROR')			print(command + ' back:\t' + rec_buff.decode())			return 0		else:			print(rec_buff.decode())			return 1	else:		print(command + ' no responce')def configureFTP(server,u_name,u_password):	send_at('AT+CFTPSSTART','OK',1)	send_at('AT+CFTPSSINGLEIP=1','OK',1)	#login to a FTP server	send_at('AT+CFTPSLOGIN=\"'+ftp_server+'\",21,\"'+ftp_user_name+'\",\"'+ftp_user_password+'\",0','OK',1)	#list all items of directory	send_at('AT+CFTPSLIST=\"/\"','OK',1)	send_at('AT+FSCD=F:/','OK',1)	send_at('AT+FSLS','OK',1)def uploadToFTP(upload_file_name):        print('upload file from FTP...')	# creat the uploadfile         send_at('AT+CFTRANRX=\"E:/'+upload_file_name+'\",12','OK',1)         send_at('1314xal1314','OK',3)	# update the uploadfile        send_at('AT+CFTPSPUTFILE=\"'+upload_file_name+'\"','OK',1)def downloadFromFTP(download_file_name):	print('Download file from FTP...') 	send_at('AT+CFTPSGETFILE=\"'+download_file_name+'\"','OK',1)try:	configureFTP(ftp_server,ftp_user_name,ftp_user_password)	time.sleep(2)	print('Uploading file to \"'+ftp_server+'\"...')	uploadToFTP(upload_file_name)        time.sleep(3)        print('Downloading file form \"'+ftp_server+'\"...')        downloadFromFTP(download_file_name)except :	if ser != None:		ser.close()

运行情况

FTPS从FTPS服务器下载文件下载到模块/从模块上载文件

阿里云FTP服务器收到文件

转载地址：http://maywi.baihongyu.com/