return {
  {
    "mfussenegger/nvim-dap",
    keys = { "<leader>d" },
    config = function()
      local dap = require("dap")

      -- GDB remote adapter (connects to Renode's GDB server)
      dap.adapters.gdb_remote = {
        type = "executable",
        command = vim.fn.executable("arm-none-eabi-gdb") == 1
          and "arm-none-eabi-gdb"
          or "gdb-multiarch",
        args = { "-i", "dap" },
      }

      -- Default debug configurations for Arduino/embedded
      dap.configurations.c = {
        {
          name = "Attach to Renode (GDB :3333)",
          type = "gdb_remote",
          request = "attach",
          target = "localhost:3333",
          cwd = "${workspaceFolder}",
          program = function()
            return vim.fn.input("ELF path: ", vim.fn.getcwd() .. "/build/", "file")
          end,
        },
      }
      dap.configurations.cpp = dap.configurations.c
      dap.configurations.arduino = dap.configurations.c

      -- Breakpoint signs
      vim.fn.sign_define("DapBreakpoint", { text = "●", texthl = "DiagnosticError" })
      vim.fn.sign_define("DapStopped", { text = "▶", texthl = "DiagnosticOk", linehl = "DiffAdd" })
    end,
  },
  {
    "rcarriga/nvim-dap-ui",
    dependencies = { "mfussenegger/nvim-dap", "nvim-neotest/nvim-nio" },
    keys = { "<leader>du" },
    config = function()
      local dapui = require("dapui")
      dapui.setup()

      -- Auto open/close UI on debug sessions
      local dap = require("dap")
      dap.listeners.after.event_initialized["dapui_config"] = function() dapui.open() end
      dap.listeners.before.event_terminated["dapui_config"] = function() dapui.close() end
      dap.listeners.before.event_exited["dapui_config"] = function() dapui.close() end
    end,
  },
  {
    "nvim-neotest/nvim-nio",
    lazy = true,
  },
}