Problem with Esp32 Development board from Adafruit

[cartere]

I have tried installing the latest ESP32 builds on this Adafruit board and all is good until I try to import network.

I (1446) cpu_start: Starting scheduler on PRO CPU.
OSError: [Errno 2] ENOENT
MicroPython v1.8.7-786-g51642d7e on 2017-05-22; ESP32 module with ESP32
Type "help()" for more information.
>>> import network
I (87671) wifi: wifi firmware version: 6c86a1c
I (87671) wifi: config NVS flash: enabled
I (87671) wifi: config nano formating: disabled
I (87671) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (87681) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (87701) wifi: Init dynamic tx buffer num: 32
I (87701) wifi: Init dynamic rx buffer num: 64
I (87701) wifi: wifi driver task: 3ffd7e64, prio:23, stack:4096
I (87701) wifi: Init static rx buffer num: 10
I (87711) wifi: Init dynamic rx buffer num: 0
I (87711) wifi: Init rx ampdu len mblock:7
I (87721) wifi: Init lldesc rx ampdu entry mblock:4
I (87721) wifi: wifi power manager task: 0x3ffde974 prio: 21 stack: 2560
I (87731) wifi: wifi timer task: 3ffdfa04, prio:22, stack:3584
W (87731) phy_init: failed to load RF calibration data (0x1102), falling back to full calibration

After this the serial connection from putty drops. Any thoughts?

[cartere]

Answering my own question, the problem turned out to be the USB cable.

[mcauser]

Have you tried turning it off and o...

[Thanatos]

For me, it was the usb cable as well. Even though everything worked, even BLE sending and receiving, the WIFI wouldn't work.

[pythoncoder]

This should be a FAQ somewhere. If an ESPx works, but crashes when you fire up the WiFi, it's voltage drop on the USB cable. The solution is a short cable with big power conductors.

[Erik]

Here is a Docker image for ESP32 esp-open-skd https://github.com/T-vK/docker-esp-sdk/tree/esp32
Including a good documentation how-to