No completion from arduino language server

Language Server Protocol (LSP)
1

Hi there,

i’m trying to setup the arduino language server, without success.
I guess there is something wrong or missing in the configuration, but i don’t know what it is.
Any help or tip is appreciated.

My Setup:

  • macos Big Sur / 11.6
  • neovim 0.5.1
  • Arduino IDE 2 provides arduino-cli, arduino language server and clangd
  • checkhealth
health#lspconfig#check
========================================================================
## Checking language server protocol configuration
  - INFO: arduino_language_server: configuration checked.

health#nvim#check
========================================================================
## Configuration
  - OK: no issues found

## Performance
  - OK: Build type: Release

## Remote Plugins
  - OK: Up to date

## terminal
  - INFO: key_backspace (kbs) terminfo entry: key_backspace=^H
  - INFO: key_dc (kdch1) terminfo entry: key_dc=\E[3~
  - INFO: $COLORTERM='truecolor'
  • Lspinfo
Language client log: /Users/lars/.cache/nvim/lsp.log
~                           Detected filetype:   arduino
~
~                           1 client(s) attached to this buffer:
~
~                           Client: arduino_language_server (id: 1, pid: 51136, bufnr: [2])
~                            filetypes:       arduino
~                            autostart:       true
~                            root directory:  /Users/lars/Desktop
~                            cmd:             /Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server -cli-config /Users/lars/Library/Arduino15/arduino-cli.yaml -cli /Application
~                          s/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-cli -clangd /Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/bin/clangd
~
~                           Configured servers list: arduino_language_server
  • lsp.log
[START][2021-11-03 14:28:47] LSP logging initiated
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        "2021/11/03 14:28:54 \27[92mIDE --> LS     CL: REQUEST initialize 1: \27[0m\n"
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        "2021/11/03 14:28:54 IDE --> initialize 1 \27[93m locked\27[0m\n"
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        "2021/11/03 14:28:54 IDE --> initialize 1 \27[93m unlocked\27[0m\n"
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        "2021/11/03 14:28:54 INIT--- initializing workbench\n2021/11/03 14:28:54 INIT--- \27[93m locked\27[0m\n2021/11/03 14:28:54 \27[91mIDE <-- LS     CL: ANSWER UNBOUND (1): \27[0m\n2021/11/03 14:28:54     --> initialize(file:///Users/lars/Desktop)\n"
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        "2021/11/03 14:28:54 running:  /Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-cli --config-file /Users/lars/Library/Arduino15/arduino-cli.yaml compile --fqbn arduino:avr:uno --only-compilation-database --clean --source-override /var/folders/gb/xn0l1h3d6sbc9sh6mbzck6nc0000gn/T/548995187 --build-path /private/var/folders/gb/xn0l1h3d6sbc9sh6mbzck6nc0000gn/T/arduino-language-server049125476 --format json /Users/lars/Desktop\n"
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        "2021/11/03 14:28:54 \27[92mIDE --> LS     CL: NOTIFICATION initialized: \27[0m\n"
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        '2021/11/03 14:28:54 arduino-cli output: {\n  "compiler_out": "",\n  "compiler_err": "",\n  "builder_result": null,\n  "success": false\n}\n\n'
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        "2021/11/03 14:28:54 INIT--- initializing workbench (done)\n2021/11/03 14:28:54 INIT--- \27[93m unlocked\27[0m\n2021/11/03 14:28:54 IDE --> initialized notif1 \27[93m read-locked\27[0m\n"
[ERROR][2021-11-03 14:28:54] .../vim/lsp/rpc.lua:462    "rpc"   "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server" "stderr"        "2021/11/03 14:28:54 IDE --> initialized notif1 notification is not propagated to clangd\n2021/11/03 14:28:54 IDE --> initialized notif1 \27[93m read-unlocked\27[0m\n2021/11/03 14:28:54 \27[92mIDE --> LS     CL: NOTIFICATION textDocument/didOpen: \27[0m\n2021/11/03 14:28:54 IDE --> textDocument/didOpen notif2 \27[93m locked\27[0m\n2021/11/03 14:28:54 IDE --> textDocument/didOpen notif2 (throttled: waiting for clangd)\n2021/11/03 14:28:54 IDE --> textDocument/didOpen notif2 \27[93m unlocked (waiting clangd)\27[0m\n"
  • init.vim
" vim-plug
call plug#begin(stdpath('data') . '/plugged')

Plug 'neovim/nvim-lspconfig'
Plug 'arduino/arduino-language-server'

Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'hrsh7th/cmp-buffer'
Plug 'hrsh7th/cmp-path'
Plug 'hrsh7th/cmp-cmdline'
Plug 'hrsh7th/nvim-cmp'
" Initialize plugin system
call plug#end()

set completeopt=menu,menuone,noselect
" Arduino LAnguage Server
"

lua <<EOF
vim.lsp.set_log_level("error")
  -- Setup lspconfig.
  local capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities())

require'lspconfig'.arduino_language_server.setup({
    capabilities = capabilities,
cmd = { "/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-language-server",
        "-cli-config","/Users/lars/Library/Arduino15/arduino-cli.yaml",
        "-cli","/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/arduino-cli",
        "-clangd","/Applications/Arduino IDE.app/Contents/Resources/app/node_modules/arduino-ide-extension/build/bin/clangd",
        }
})

-----


  -- Setup nvim-cmp.
local cmp = require'cmp'

cmp.setup({
    mapping = {
      ['<C-d>'] = cmp.mapping(cmp.mapping.scroll_docs(-4), { 'i', 'c' }),
      ['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(4), { 'i', 'c' }),
      ['<S-Space>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
      ['<C-y>'] = cmp.config.disable, -- Specify `cmp.config.disable` if you want to remove the default `<C-y>` mapping.
      ['<C-e>'] = cmp.mapping({
        i = cmp.mapping.abort(),
        c = cmp.mapping.close(),
      }),
      ['<CR>'] = cmp.mapping.confirm({ select = true }),
    },
    sources = cmp.config.sources({
      { name = 'nvim_lsp' },
    }, {
      { name = 'buffer' },
    })
  })
--[[
  -- Use buffer source for `/` (if you enabled `native_menu`, this won't work anymore).
  cmp.setup.cmdline('/', {
    sources = {
      { name = 'buffer' }
    }
  })

  -- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
  cmp.setup.cmdline(':', {
    sources = cmp.config.sources({
      { name = 'path' }
    }, {
      { name = 'cmdline' }
    })
  })
--]]
EOF
2

In your init.vim miss choice FQBN. Example my cmd:

cmd =  {                                                                                                                                                                                            
            'arduino-language-server',                                                                              
            '-cli-config', '/home/radek/.arduino15/arduino-cli.yaml',                                               
            '-cli', '/home/radek/bin/arduino-cli',                                                                  
            '-clangd', '/usr/bin/clangd',                                                                           
            '-fqbn', 'esp32:esp32:esp32'                                                                            
        }
3

Or with your configuration. You can added file named sketch.json in project directory. With this content in your case:

{                                                                                                                   
  "cpu": {                                                                                                          
    "fqbn": "arduino:avr:uno",                                                                                    
    "port": ""                                                                                                      
  }                                                                                                                 
}