Cannot connect to gdbserver about nvim-dap

[mfussenegger]

The server type is for debug adapters that communicate via TCP with the client(=nvim-dap) . That's not the case with gdb -i dap, which uses stdio.

You need to use the executable type for gdb itself:

dap.adapters.gdb = {
  type = "executable",
  command = "gdb",
  args = { "-i", "dap" }
}

And then an attach configuration, to tell that gdb should connect to the gdbserver:

dap.configurations.c = {
  {
    name = "gdbserver: attach",
    type = "gdb",
    request = "attach",
    target = "localhost:1234",
    cwd = '${workspaceFolder}',
  },
}

So the communication is:

  ┌──────────┐ DAP ┌─────┐        ┌──────────┐       ┌───────────────┐
  │ nvim-dap │────►│ gdb │───────►│ gdbserver│──────►│your-executable│
  └──────────┘     └─────┘        └──────────┘       └───────────────┘

[PrettRett]

Thank you!!