ESP8266 Community Forum

I'm trying to upload a nodemcu script using a cp2102, it come mounted on /dev/ttyUSB0 but it can't communicate with the module. All the wires connection are ok, and I've also tried with a Windows pc and it work , so the problem is software side. This is the dmesg output:

[ 3144.796181] usb 5-1: new full-speed USB device number 70 using uhci_hcd
[ 3144.957166] usb 5-1: New USB device found, idVendor=10c4, idProduct=ea60
[ 3144.957174] usb 5-1: New USB device strings: Mfr=1,Product=2,SerialNumber=3
[ 3144.957180] usb 5-1: Product: CP2102 USB to UART Bridge Controller
[ 3144.957184] usb 5-1: Manufacturer: Silicon Labs
[ 3144.957188] usb 5-1: SerialNumber: 0001
[ 3144.962334] cp210x 5-1:1.0: cp210x converter detected
[ 3144.964477] usb 5-1: cp210x converter now attached to ttyUSB0
and this what appear when I try to upload the code:

python luatool.py -p /dev/ttyUSB0 -b 9600 -f webserver.lua -t webserver.lua

s->file.open("webserver.lua", "w")Traceback (most recent call last):
File "luatool.py", line 118, in <module>
writeln("file.open(\""+args.dest+"\", \"w\")\r")
File "luatool.py", line 41, in writeln
raise Exception('No proper answer from MCU')
Exception: No proper answer from MCU

I don't really have any experience with the CP2102, but what happens if you use a serial terminal program and connect the CP2102 in loopback? You should see the characters echoed to the screen. Are you sure your linux user is a member of the right group to access tty? I would think that you would get a different error if not, but you can try to run luatool as root just to see.

The user already have permission for to access tty. Anyway I've tried with sudo but no solved :/

What happens when you try talking to the ESP-8266 with the adapter, something like:

screen /dev/USB0 9600