99 lines
2.8 KiB
Lua
99 lines
2.8 KiB
Lua
-- SPDX-FileCopyrightText: 2017 Daniel Ratcliffe
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--
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-- SPDX-License-Identifier: LicenseRef-CCPL
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local function printUsage()
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local programName = arg[0] or fs.getName(shell.getRunningProgram())
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print("Usages:")
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print(programName .. " host")
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print(programName .. " host <x> <y> <z>")
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print(programName .. " locate")
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end
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local tArgs = { ... }
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if #tArgs < 1 then
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printUsage()
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return
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end
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local sCommand = tArgs[1]
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if sCommand == "locate" then
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-- "gps locate"
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-- Just locate this computer (this will print the results)
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gps.locate(2, true)
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elseif sCommand == "host" then
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-- "gps host"
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-- Act as a GPS host
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if pocket then
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print("GPS Hosts must be stationary")
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return
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end
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-- Find a modem
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local sModemSide = nil
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for _, sSide in ipairs(rs.getSides()) do
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if peripheral.getType(sSide) == "modem" then
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sModemSide = sSide
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break
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end
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end
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if sModemSide == nil then
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print("No wireless modems found. 1 required.")
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return
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end
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-- Determine position
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local x, y, z
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if #tArgs >= 4 then
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-- Position is manually specified
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x = tonumber(tArgs[2])
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y = tonumber(tArgs[3])
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z = tonumber(tArgs[4])
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if x == nil or y == nil or z == nil then
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printUsage()
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return
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end
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print("Position is " .. x .. "," .. y .. "," .. z)
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else
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-- Position is to be determined using locate
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x, y, z = gps.locate(2, true)
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if x == nil then
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print("Run \"gps host <x> <y> <z>\" to set position manually")
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return
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end
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end
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-- Open a channel
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local modem = peripheral.wrap(sModemSide)
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print("Opening channel on modem " .. sModemSide)
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modem.open(gps.CHANNEL_GPS)
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-- Serve requests indefinitely
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local nServed = 0
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while true do
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local e, p1, p2, p3, p4, p5 = os.pullEvent("modem_message")
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if e == "modem_message" then
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-- We received a message from a modem
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local sSide, sChannel, sReplyChannel, sMessage, nDistance = p1, p2, p3, p4, p5
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if sSide == sModemSide and sChannel == gps.CHANNEL_GPS and sMessage == "PING" and nDistance then
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-- We received a ping message on the GPS channel, send a response
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modem.transmit(sReplyChannel, gps.CHANNEL_GPS, { x, y, z })
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-- Print the number of requests handled
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nServed = nServed + 1
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if nServed > 1 then
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local _, y = term.getCursorPos()
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term.setCursorPos(1, y - 1)
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end
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print(nServed .. " GPS requests served")
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end
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end
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end
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else
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-- "gps somethingelse"
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-- Error
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printUsage()
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end
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