how to check vim server status

Hi, Does anyone know how to check the vim server free/busy status?

I tried the following solution. But I just always get busy from repl...

call remote_send("REMOTESERVER", ":echo " . 'server2client(expand("<client>"), "busy")<CR>', "serverid")
call remote_send("REMOTESERVER", ":sleep 10<CR>", "serverid")
call remote_send("REMOTESERVER", ":echo " . 'server2client(expand("<client>"), "free")<CR>', "serverid")
let repl = ""
echo "PEEK: ".remote_peek(serverid, "repl").": ".repl

thanks~

--
All the best,

Zhao Cai

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