ESP8266 Community Forum

Busy has little to do with routers - if you check elsewhere there is a condition which I've never seen satisfactorily explained OR resolved where the board goes into some kind of "busy" mode and returns the message "busy s". I only wish my Linux skills were a little better as I'd go in there and fix it myself. It is just about the only thing now that's deterring me from shoving these boards into a variety of projects.

Did you start having this 'busy now' issue since trying to attempt to connect to your router?

That is how my problem began, and the reason was that I had defined a wrong password to connect to the router. So the chip continuosly keeps trying, unsucessfully, to log in. The solution is to disengage the attempts by AT+CWQAP, followed immediately by a re-assignation of the SSID and the password. Also, remember, your password and SSID are case sensitive. (this is where I had messed up)

Hope this helps!

I recommend this firmware https://github.com/igrr/atproto
It solves busy problem and has better documentation than original one.