NodeMCU SMTP 电子邮件

Question

我正在使用 NodeMCU（此处为文档 http://nodemcu.readthedocs.io/）尝试通过 SMTP 发送电子邮件。我从网上得到了这个脚本，一切似乎都正常，因为没有错误，但我没有在我的邮箱中看到任何电子邮件，所以一定是出了问题。不幸的是，使用 display 函数作为发送回调打印 nil。

我能够通过简单的 curl 发送 smtp 电子邮件，因此我知道 google 将通过命令行接受 smtp 请求并且这些设置是正确的。同样根据这个线程，他们正在做同样的事情，将原始字符串发送到 gmail 的 smtp 服务 (http://www.esp8266.com/viewtopic.php?f=24&t=1231&start=8)。

-- The email and password from the account you want to send emails from
MY_EMAIL = "REDACTED"
EMAIL_PASSWORD = "REDACTED"

-- The SMTP server and port of your email provider.
-- If you don't know it google [my email provider] SMTP settings
SMTP_SERVER = "smtp.gmail.com"
SMTP_PORT = "465"

-- The account you want to send email to
mail_to = "REDACTED"

-- Your access point's SSID and password
SSID = "REDACTED"
SSID_PASSWORD = "REDACTED"

-- configure ESP as a station
wifi.setmode(wifi.STATION)
wifi.sta.config(SSID,SSID_PASSWORD)
wifi.sta.autoconnect(1)

email_subject = ""
email_body = ""
count = 0


local smtp_socket = nil -- will be used as socket to email server

-- The display() function will be used to print the SMTP server's response
function display(sck,response)
     print(response)
end

-- The do_next() function is used to send the SMTP commands to the SMTP server in the required sequence.
-- I was going to use socket callbacks but the code would not run callbacks after the first 3.
function do_next()
            if(count == 0)then
                count = count+1
                IP_ADDRESS = wifi.sta.getip()
                smtp_socket:send("HELO "..IP_ADDRESS.."\r\n")
            elseif(count==1) then
                count = count+1
                smtp_socket:send("AUTH LOGIN\r\n")
            elseif(count == 2) then
                count = count + 1
                smtp_socket:send("REDACTED".."\r\n")
            elseif(count == 3) then
                count = count + 1
                smtp_socket:send("REDACTED".."\r\n")
            elseif(count==4) then
                count = count+1
               smtp_socket:send("MAIL FROM:<" .. MY_EMAIL .. ">\r\n")
            elseif(count==5) then
                count = count+1
               smtp_socket:send("RCPT TO:<" .. mail_to ..">\r\n")
            elseif(count==6) then
                count = count+1
               smtp_socket:send("DATA\r\n")
            elseif(count==7) then
                count = count+1
                local message = string.gsub(
                "From: \"".. MY_EMAIL .."\"<"..MY_EMAIL..">\r\n" ..
                "To: \"".. mail_to .. "\"<".. mail_to..">\r\n"..
                "Subject: ".. email_subject .. "\r\n\r\n"  ..
                email_body,"\r\n.\r\n","")

                smtp_socket:send(message.."\r\n.\r\n")
            elseif(count==8) then
               count = count+1
                 tmr.stop(0)
                 smtp_socket:send("QUIT\r\n")
                 print("msg sent")
            else
               smtp_socket:close()
            end
            print(count)
end

-- The connectted() function is executed when the SMTP socket is connected to the SMTP server.
-- This function will create a timer to call the do_next function which will send the SMTP commands
-- in sequence, one by one, every 5000 seconds. 
-- You can change the time to be smaller if that works for you, I used 5000ms just because.
function connected(sck)
    tmr.alarm(0,5000,1,do_next)
end

-- @name send_email
-- @description Will initiated a socket connection to the SMTP server and trigger the connected() function
-- @param subject The email's subject
-- @param body The email's body
function send_email(subject,body)

     count = 0
     email_subject = subject
     email_body = body
     smtp_socket = net.createConnection(net.TCP,0)
     smtp_socket:on("connection",connected)
     smtp_socket:on("receive",display)
    smtp_socket:connect(SMTP_PORT, SMTP_SERVER)     
end
-- Send an email
send_email("ESP8266", "[[Hi, How are your IoT projects coming along? Best Wishes,ESP8266]]")

我可以回答有关此的问题。

Answer 1

几点：

• 您提到的来自 esp8266.com 的旧示例使用连续的socket:send 调用，这在最近的固件中不再起作用，请参阅http://nodemcu.readthedocs.io/en/dev/en/modules/net/#netsocketsend。这是曾经有效的 SDK 中的一个“错误”。
• SMTP 端口 465 通常意味着 SSL/TLS 连接。您需要一个支持该功能的固件。否则使用端口 25。
• NodeMCU 存储库中有一个示例，地址为https://github.com/nodemcu/nodemcu-firmware/blob/master/lua_examples/email/send_email_smtp.lua
• 我假设您确实用 base64 编码的用户名和密码替换了 do_next count 2/3 的占位符？与需要 Lua 编码器模块的示例脚本相反，您可能希望使用相应的 NodeMCU 模块，请参阅http://nodemcu.readthedocs.io/en/dev/en/modules/encoder/#encodertobase64。

我使用了你的脚本，一个最近的 NodeMCU 固件，将端口更改为 25，添加了 base64 编码用户/密码，并且能够成功地将电子邮件发送给我自己。

2016 年 7 月 5 日更新

包含 WiFi 初始化的完整脚本。

MY_EMAIL = "myself@my-TLD.com"
MY_EMAIL_B64 = "base64-encoded-email"
EMAIL_PASSWORD_B64 = "base64-encoded-password"

SMTP_SERVER = "my-ISPs-server"
SMTP_PORT = 25

mail_to = "myself@my-TLD.com"

email_subject = ""
email_body = ""
count = 0

smtp_socket = nil

function display(sck,response)
  print(response)
end

function do_next()
  if(count == 0)then
    count = count+1
    local IP_ADDRESS = wifi.sta.getip()
    smtp_socket:send("HELO "..IP_ADDRESS.."\r\n")
  elseif(count==1) then
    count = count+1
    smtp_socket:send("AUTH LOGIN\r\n")
  elseif(count == 2) then
    count = count + 1
    smtp_socket:send(MY_EMAIL_B64.."\r\n")
  elseif(count == 3) then
    count = count + 1
    smtp_socket:send(EMAIL_PASSWORD_B64.."\r\n")
  elseif(count==4) then
    count = count+1
    smtp_socket:send("MAIL FROM:<" .. MY_EMAIL .. ">\r\n")
  elseif(count==5) then
    count = count+1
    smtp_socket:send("RCPT TO:<" .. mail_to ..">\r\n")
  elseif(count==6) then
    count = count+1
    smtp_socket:send("DATA\r\n")
  elseif(count==7) then
    count = count+1
    local message = string.gsub(
      "From: \"".. MY_EMAIL .."\"<"..MY_EMAIL..">\r\n" ..
              "To: \"".. mail_to .. "\"<".. mail_to..">\r\n"..
              "Subject: ".. email_subject .. "\r\n\r\n"  ..
              email_body,"\r\n.\r\n","")

    smtp_socket:send(message.."\r\n.\r\n")
  elseif(count==8) then
    count = count+1
    tmr.stop(0)
    smtp_socket:send("QUIT\r\n")
  else
    smtp_socket:close()
  end
end

function connected(sck)
  tmr.alarm(0,3000,1,do_next)
end

function send_email(subject,body)
  count = 0
  email_subject = subject
  email_body = body
  smtp_socket = net.createConnection(net.TCP,0)
  smtp_socket:on("connection",connected)
  smtp_socket:on("receive",display)
  smtp_socket:connect(SMTP_PORT,SMTP_SERVER)
end

SSID = "my-SSID"
SSID_PASSWORD = "my-WiFi-password"
wifi.setmode(wifi.STATION)
wifi.sta.config(SSID,SSID_PASSWORD)

tmr.alarm(1, 1000, 1, function()
  if wifi.sta.getip()== nil then
    print("IP unavaiable, Waiting...")
  else
    tmr.stop(1)
    print("Config done, IP is "..wifi.sta.getip())
    send_email(
      "ESP8266",
      [[Hi,
      How are your IoT projects coming along?
      Best Wishes,
      ESP8266]])
  end
end)