我无法连接到mqtt broker＆＃34; hivemq＆＃34;直到DNS重试2次。 问题是Dns在代码全部执行后重试，所以尽管它连接到代理，我仍然无法发布任何消息。 我试过设置DNS服务器，但它没有解决任何问题。 我在mac上使用ESPlorer ide。 感谢您的帮助，Luca
ssid = "my ssid"
pswd = "my pswd"
wifi.setmode(wifi.STATION)
print("connecting to wifi")
wifi.sta.config(ssid,pswd)
tmr.delay(5000000)
print(wifi.sta.getip())
net.dns.setdnsserver("8.8.8.8", 0)--sets google first dns server--
net.dns.setdnsserver("8.8.8.8") --equal to above
net.dns.setdnsserver("8.8.4.4", 1) --sets google second dns server
--net.dns.setdnsserver("208.67.222.222", 0)--sets opendns first dns server
--net.dns.setdnsserver("208.67.222.222") --equal to
--net.dns.setdnsserver("208.67.220.220", 1) --sets opendns second dns server
--net.dns.getdnsserver(0) --gets first dns server
--net.dns.getdnsserver() --equal to above
--net.dns.getdnsserver(1) --gets second dns server
net.dns.resolve("www.google.com", function (socket,ip)
if ip == nil then print("error: DNS fail!") else print(ip) end
end )
tmr.delay(5000000)
m=mqtt.Client("nodemcu", 1200, "username", "password")
print("hey")
connected = false
m:connect("broker.hivemq.com", function(client) print("connected to broker") connected = true end, function(client,reason) print("reason:") print(reason) end)
tmr.delay(5000000)
if connected==true then print("connected is true") else print("connected is false") end
tmr.delay(10000000)
m:publish("/topic", "hello", 0, function(client) print("message published")end)
这是我从nodemcu开发工具包1.0获得的：
192.168.1.64 255.255.255.0 192.168.1.254
hey
connected is false
init.lua:47: not connected
stack traceback:
[C]: in function 'publish'
init.lua:47: in main chunk
[C]: in function 'dofile'
stdin:1: in main chunk
> DNS retry 1!
DNS retry 2!
connected to broker