added a ping util for testing network connectivity

exec/ping.lua

@@ -0,0 +1,17 @@
+local minitel = require "minitel"
+local event = require "event"
+local tArgs = {...}
+local addr = tArgs[1]
+local times = tonumber(tArgs[2]) or 5
+local timeout = tonumber(tArgs[3]) or 30
+for i = 1, times do
+ local ipt = computer.uptime()
+ local pid = minitel.genPacketID()
+ computer.pushSignal("net_send",1,addr,0,"ping",pid)
+ local t,a = event.pull(timeout,"net_ack")
+ if t == "net_ack" and a == pid then
+  print("Ping reply: "..tostring(computer.uptime()-ipt).." seconds.")
+ else
+  print("Timed out.")
+ end
+end