CLIENT:

RegisterNetEvent('sendProximityMessageDo')
AddEventHandler('sendProximityMessageDo', function(id, name, message)
  local myId = PlayerId()
  local pid = GetPlayerFromServerId(id)
  if pid == myId then
    TriggerEvent('chatMessage', "", {255, 0, 0}, " ^6Obywatel[" .. GetPlayerServerId(PlayerId()) .. "]^6  " .. message)
  elseif GetDistanceBetweenCoords(GetEntityCoords(GetPlayerPed(myId)), GetEntityCoords(GetPlayerPed(pid)), true) < 19.999 then
    TriggerEvent('chatMessage', "", {255, 0, 0}, " ^6Obywatel[" .. GetPlayerFromServerId(id) .. "]^6  " .. message)
  end
end)

SERVER:

  TriggerEvent('es:addCommand', 'do', function(source, args, user)
      local name = getIdentity(source)
      TriggerClientEvent("sendProximityMessageDo", -2, source, name.firstname .. ' ' .. name.lastname, table.concat(args, " "))
  end)