ESP8266 - transfer some bytes PC<>PIC over wifi

[flotulopex]

Hi there,

I'd like to transfer a config ".TXT" file (it's a bunch of 100 bytes or so) from my PC to a PIC over wifi.

So first things first: power it up and find some AP to connect to.

BTW, this is the very common module I have, the ESP-01S:



My first action is to get connected to the wifi, but I always get an error message when trying to list the networks (I can see at least five APs on my mobile):




Has this "ERROR" something to do with the firmware? There are so many versions out there (mine looks already old...2015...) that I don't know where to look at for a start....

[flotulopex]

Okay, for now, I'm trying to get started with this piece of info https://www.instructables.com/Gettin...SP8266-ESP-01/

🤞

[Ioannis]

Have you found what caused the Error?

Very interesting instructable link. Thank you!

Ioannis

[HenrikOlsson]

Have you tried with CWMODE = 3?

Also, see this:

https://stackoverflow.com/questions/...ith-no-details

[flotulopex]

Have you tried with CWMODE = 3?

No. I'll give it a try when I'm back from office.

[HenrikOlsson]

I tried with an old module I had laying around.
I got the same issue no matter which CWMODE. But in the Stackoverflow post I linked to user urbanSoft (so all credit to him) writes:

That AT+CWLAP returns an error without any prior connection is desired behaviour.
The doc states that "AT+CWLAP connects an ESP station to a targeted AP with the last Wi-Fi configuration."

Since there is no last Wi-Fi configuration an error is returned.

So I tried that by connecting it to my network using AT+CWJAP="myssid","mypassword" and after that CWLAP worked as expected.

My module is really old with stock firmware. AT commands have changed and been added over the years so don't expect any and all examples you find on the internet to just work if they don't match the firmware.

[flotulopex]

Have you tried with CWMODE = 3?

...as you suggested, I tried with mode 3 and:



Thank you very much Henrik

[flotulopex]

Have you found what caused the Error?

Unfortunately, no.

Still searching....