Micropython Programming: Error Codes

Micropython is a complete sub-set of the Python 3 programming language. Designed for ease of use on microcontrollers, it can be used as an operating system for the advanced ESP32 microcontroller.

The ESP32 with Micropython is a small but complete computing system, and we often refer to it as a microprocessor rather than just a microcontroller. It actually has an operating system that allows you to create/delete directories and files.

We have created educational kits for using Micropython with the ESP32 MCU, with a blind motor (or window opener, or low voltage relay modules) that you can use in your home. This is a great gift for anyone interested in learning how to use the ESP32. Please see the links at the bottom of this page for more info.

The table below displays a list of Micropython error codes, with a description of the meaning of each code. These error codes can be trapped so that the python script doesn't crash (see start_data_MQTT for a good example of this).

Micropython OS Error Codes This page displays a list of Micropython error codes that are specific to this device. If you have a different board there may be some slight variations. Use CTRL-f to find the code you need in this page ... Key: 1 Code: EPERM Meaning: Operation not permitted --- Key: 2 Code: ENOENT Meaning: No such file or directory --- Key: 110 Code: ETIMEDOUT Meaning: Connection timed out --- Key: 22 Code: EINVAL Meaning: Invalid argument --- Key: 111 Code: ECONNREFUSED Meaning: Connection refused --- Key: 5 Code: EIO Meaning: I/O error --- Key: 113 Code: EHOSTUNREACH Meaning: No route to host --- Key: 95 Code: EOPNOTSUPP Meaning: Operation not supported on transport endpoint --- Key: 114 Code: EALREADY Meaning: Operation already in progress --- Key: 9 Code: EBADF Meaning: Bad file number --- Key: 98 Code: EADDRINUSE Meaning: Address already in use --- Key: 11 Code: EAGAIN Meaning: Try again --- Key: 12 Code: ENOMEM Meaning: Out of memory --- Key: 13 Code: EACCES Meaning: Permission denied --- Key: 115 Code: EINPROGRESS Meaning: Operation now in progress --- Key: 103 Code: ECONNABORTED Meaning: Software caused connection abort --- Key: 104 Code: ECONNRESET Meaning: Connection reset by peer --- Key: 17 Code: EEXIST Meaning: File exists --- Key: 105 Code: ENOBUFS Meaning: No buffer space available --- Key: 19 Code: ENODEV Meaning: No such device --- Key: 107 Code: ENOTCONN Meaning: Transport endpoint is not connected --- Key: 21 Code: EISDIR Meaning: Is a directory ---

You can purchase educational kits for blinds and window openers, and our control products in our online DIY automation store.

Stay tuned, if you're interested; we are taking the journey into IoT and automation, writing about every step we take!

Adrian Biffen
Senior Partner
RollerTrol Automation Systems

We sincerely hope you enjoy our advanced technology products; if you have any questions, please contact us at any time!

Articles in this series:

Part 1: Micropython for the ESP32: Connecting to Your WiFi Router Network

Part 2: Micropython for the ESP32 Microcontroller: REPL Communications

Part 3: Micropython for the ESP32: FTP Fast File Transfer

Part 4: Micropython for the ESP32: Pre-loaded Programs

Part 5: Micropython for the ESP32: DC Motor Reversing Switch

Part 6: Micropython for the ESP32: WiFi Blind Motor Educational Kit Components

Part 7: Micropython for the ESP32: Error Codes and Definitions (you are here)