ESP Troubleshooting 101

esptool.md

$ esptool.py chip_id
esptool.py v2.5.1
Found 1 serial ports
Serial port /dev/ttyUSB0
Connecting....
Detecting chip type... ESP8266
Chip is ESP8266EX
Features: WiFi
MAC: 84:f3:eb:0b:dd:53
Uploading stub...
Running stub...
Stub running...
Chip ID: 0x000bdd53
Hard resetting via RTS pin...

TroubleShooting

Permission denied

$ esptool.py chip_id
esptool.py v2.5.1
Found 1 serial ports
Serial port /dev/ttyUSB0
/dev/ttyUSB0 failed to connect: [Errno 13] could not open port /dev/ttyUSB0: [Errno 13] Permission denied: '/dev/ttyUSB0'

A fatal error occurred: All of the 1 available serial ports could not connect to a Espressif device.

Solution (choose only one of this):

• sudo chmod 666 /dev/ttyUSB0
• set an UDEV rule to permanently allow the access
• add $USER to dialout group

Device or resource busy

$ esptool.py chip_id
esptool.py v2.5.1
Found 1 serial ports
Serial port /dev/ttyUSB0
/dev/ttyUSB0 failed to connect: [Errno 16] could not open port /dev/ttyUSB0: [Errno 16] Device or resource busy: '/dev/ttyUSB0'

A fatal error occurred: All of the 1 available serial ports could not connect to a Espressif device.

Solution:

1. Gather some infos which process/app use that Serial port. For example:

$ lsof /dev/ttyUSB0
COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
screen  21416 wildan    5u   CHR  188,0      0t0  499 /dev/ttyUSB0

2. Kill that process/command: killall screen

Great! Keep the resource updated. Many thanks!