ESP8266 Community Forum

- Mon Mar 09, 2015 5:06 pm #11692 Hi all,

I have a file into which I store
MQTT server URL
user
password
port number

I read back the file, and then I try to connect

Code: Select all--MQTT
    file.open("config.txt", "r")
   MQTTs = file.readline()
   print("server:"..MQTTs)
   MQTTs = "m11.cloudmqtt.com"
   MQTTu = file.readline()
   MQTTp = file.readline()
   MQTTpo = file.readline()
    file.close()
print("server:"..MQTTs)

the connection is simple

Code: Select allm = net.createConnection(net.TCP, 0)
print("user:"..MQTTu)
m = mqtt.Client(MQTTu, 120, MQTTu, MQTTp)

-- and a few lines after

m:connect(MQTTs, MQTTpo, 0, function(conn)
         print("connected")
         m:subscribe("/android/",0, function(conn)
            print("subscribed")
         end)
      end)


The problem that I have is that if the server URL is read from the file... it fails with a DNS error
If I assign its value like in the example above it works.

All other values are properly read from the file

Do you have any idea why URL reading from file doesn't work ?

I have tried to print the values from file and from assignment, they look exactly the same on my terminal view...

Thank you in advance
JP

- Mon Mar 09, 2015 5:53 pm #11695 I think readline keeps the \n on the end of the line. Try file.readline():gsub("%s+$", "") to remove trailing whitespace.

- Thu Mar 12, 2015 3:36 pm #11896 You are THE BOSS

It works sooooo well

Thank you (I wouldn't have found this alone)

JP