BLYNK [122905] DHCP Failed!

Solved
1

I am starting my 3rd project using BLYNK. I have two working perfectly. I have an Arduino Mega with a network shield. Exactly the same configuration and hardware as the other 2 working projects.

One other project is on the same local network as the one I am developing. I used the same sketch as on the working one. I enabled BLYNK debug and get the following (I have some debug instructions as well)

Starting Up
Starting Blynk
[62452] Getting IP…
[122905] DHCP Failed!
Starting Up
Starting Blynk
[62453] Getting IP…
[122906] DHCP Failed!

The strange thing is it restarts the Mega every 30 seconds or so. It never gets to the loop. I need some code to prevent BLYNK to restart the system and how to make it work. I have identical hardware on 2 other systems and they have been performing for more than a month now.

Herman

2

My guess is that you’re using the same MAC address on both devices, which is confusing your router and preventing the router from handing-out an IP address via DHCP.

Pete.

3

Thanks Pete. I tried different MAC addresses but no luck. I am beginning to suspect a hardware issue. I will try with just plain internet connection and see if it works.

Any idea why the Blynk restarts the Setup routine when it fails to connect?

Herman

4

Turns out it was a hardware issue. After some research I found the a batch of the Ethernet shields were made with incorrect resistor and fails to connect.

I received a new one (from a different manufacturer) and it issues an IP address immediately however now it fails to connect to Blynk. It still restarts the SetUp loop during the connect process.
I checked Auth code and made sure the app is running on my iphone. It never gets past the BLYNK.begin(auth); statement.
This is what I get:

Starting Up
Ethernet SetUp  536979648
Starting Blynk
[7233] Getting IP...
[9507] IP:192.168.1.33
[9508] 
    ___  __          __
   / _ )/ /_ _____  / /__
  / _  / / // / _ \/  '_/
 /____/_/\_, /_//_/_/\_\
        /___/ v0.5.1 on Arduino Mega

[9620] Connecting to 222.205.174.186
[41800] Connecting to 222.205.174.186
[73949] Connecting to 222.205.174.186
[106096] Connecting to 222.205.174.186
[138245] Connecting to 222.205.174.186
[170394] Connecting to 222.205.174.186
[202529] Connecting to 222.205.174.186
5

This could be due too many reasons… incorrect AUTH code, incorrect IP address (is 222.205.174.186 correctly directing to your blynk-cloud.com? ), etc.

6

OK I found it. I had an old setup with the incorrect server IP. Set to default and it works.

7

Thanks for all the help. The hardware problem is always the most time consuming to find. I will send the faulty W5100.

Now solved.