platformio/platformio-core

Neovim + Arduino + PlatformIO

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#5188 opened on Jun 24, 2025

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 (2 comments) (1 reaction) (0 assignees)Python (7,329 stars) (791 forks)batch import
help wantedintegration

Description

Hello,

I am working on a project that uses the arduino framework, and I am having issues running clangd/arduino-language-server LSP's on my .ino project file.

This may be the completely wrong place to post such questions but maybe someone here has a solution?

The problem lies with needing to run the arduino cli in order to get lsp support for an .ino file that contains arduino specific code, that is not available in the pio cli.

This forum post perfectly outlines my issue: https://community.platformio.org/t/using-arduino-language-server-with-platformio-in-neovim-possible/44134

This is the error I get upon trying to load the arduino language server [START][2025-06-24 09:11:36] LSP logging initiated [ERROR][2025-06-24 09:11:36] ...p/_transport.lua:36 "rpc" "arduino-language-server" "stderr" "09:11:36.503010 Path to ArduinoCLI config file must be set.\n"

Contributor guide

Tech stack
cpppython
Domain
toolingdeveloper experiencecli
Issue type
research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Neovim LSP setupPlatformIO installedArduino CLI installedC/C++ knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
The error indicates that the Arduino CLI config file path is not set. The solution may involve setting the `arduino cli` path in platformio.ini or configuring the LSP client in Neovim to pass the correct config file. A good starting point is to look at the Arduino Language Server documentation and the forum post linked in the issue. Contributions could include adding a setup guide to the platformio core documentation.