[fluksod] skeleton implementation of message processing on spidev bus

mote/v2/openwrt/package/flukso/Makefile

@@ -3,7 +3,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=flukso
-PKG_VERSION:=2.0
+PKG_VERSION:=2.0-alpha
 PKG_RELEASE:=1
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
@@ -15,6 +15,8 @@ define Package/flukso
 	CATEGORY:=Utilities
 	DEPENDS:=+libdaemon +ntpclient +liblua +luci-nixio +rrdtool1
 	TITLE:=Flukso - community metering
+	URL:=http://www.flukso.net
+	MAINTAINER:=Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
 endef
 
 define Package/flukso/description
@@ -32,10 +34,12 @@ define Package/flukso/install
 	$(INSTALL_DATA) $(PKG_BUILD_DIR)/dbg.lua $(1)/usr/lib/lua/
 	$(INSTALL_DIR) $(1)/usr/lib/lua/rrd
 	$(INSTALL_DATA) $(PKG_BUILD_DIR)/rrd/*.lua $(1)/usr/lib/lua/rrd/
+	$(INSTALL_DIR) $(1)/usr/lib/lua/flukso
+	$(INSTALL_DATA) $(PKG_BUILD_DIR)/flukso/*.lua $(1)/usr/lib/lua/flukso/
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/luad $(1)/usr/sbin/
-	$(LN) /usr/sbin/luad $(1)/usr/sbin/spid
+	$(LN) /usr/sbin/luad $(1)/usr/sbin/fluksod
-	$(INSTALL_BIN) $(PKG_BUILD_DIR)/spi/spid.lua $(1)/usr/sbin/
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/fluksod.lua $(1)/usr/sbin/
 endef
 
 $(eval $(call BuildPackage,flukso))

mote/v2/openwrt/package/flukso/luasrc/flukso/BinDecHex.lua

@@ -0,0 +1,517 @@
+--[[
+/*
+ * Copyright (c) 2007 Tim Kelly/Dialectronics
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the 
+ * "Software"),  to deal in the Software without restriction, including 
+ * without limitation the rights to use, copy, modify, merge, publish, 
+ * distribute, sublicense, and/or sell copies of the Software, and to permit 
+ * persons to whom the Software is furnished to do so, subject to the 
+ * following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT 
+ * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+--]]
+
+
+module(..., package.seeall);
+
+local hex2bin = {
+	["0"] = "0000",
+	["1"] = "0001",
+	["2"] = "0010",
+	["3"] = "0011",
+	["4"] = "0100",
+	["5"] = "0101",
+	["6"] = "0110",
+	["7"] = "0111",
+	["8"] = "1000",
+	["9"] = "1001",
+	["a"] = "1010",
+        ["b"] = "1011",
+        ["c"] = "1100",
+        ["d"] = "1101",
+        ["e"] = "1110",
+        ["f"] = "1111"
+	}
+
+
+
+local bin2hex = {
+	["0000"] = "0",
+	["0001"] = "1",
+	["0010"] = "2",
+	["0011"] = "3",
+	["0100"] = "4",
+	["0101"] = "5",
+	["0110"] = "6",
+	["0111"] = "7",
+	["1000"] = "8",
+	["1001"] = "9",
+	["1010"] = "A",
+        ["1011"] = "B",
+        ["1100"] = "C",
+        ["1101"] = "D",
+        ["1110"] = "E",
+        ["1111"] = "F"
+	}
+
+--[[
+local dec2hex = {
+	["0"] = "0",
+	["1"] = "1",
+	["2"] = "2",
+	["3"] = "3",
+	["4"] = "4",
+	["5"] = "5",
+	["6"] = "6",
+	["7"] = "7",
+	["8"] = "8",
+	["9"] = "9",
+	["10"] = "A",
+	["11"] = "B",
+	["12"] = "C",
+	["13"] = "D",
+	["14"] = "E",
+	["15"] = "F"
+	}
+--]]
+
+
+-- These functions are big-endian and take up to 32 bits
+
+-- Hex2Bin
+-- Bin2Hex
+-- Hex2Dec
+-- Dec2Hex
+-- Bin2Dec
+-- Dec2Bin
+
+
+function Hex2Bin(s)
+
+-- s	-> hexadecimal string
+
+local ret = ""
+local i = 0
+
+
+	for i in string.gfind(s, ".") do
+		i = string.lower(i)
+
+		ret = ret..hex2bin[i]
+
+	end
+
+	return ret
+end
+
+
+function Bin2Hex(s)
+
+-- s 	-> binary string
+
+local l = 0
+local h = ""
+local b = ""
+local rem
+
+l = string.len(s)
+rem = l % 4
+l = l-1
+h = ""
+
+	-- need to prepend zeros to eliminate mod 4
+	if (rem > 0) then
+		s = string.rep("0", 4 - rem)..s
+	end
+
+	for i = 1, l, 4 do
+		b = string.sub(s, i, i+3)
+		h = h..bin2hex[b]
+	end
+
+	return h
+
+end
+
+
+function Bin2Dec(s)
+
+-- s	-> binary string
+
+local num = 0
+local ex = string.len(s) - 1
+local l = 0
+
+	l = ex + 1
+	for i = 1, l do
+		b = string.sub(s, i, i)
+		if b == "1" then
+			num = num + 2^ex
+		end
+		ex = ex - 1
+	end
+
+	return string.format("%u", num)
+
+end
+
+
+
+function Dec2Bin(s, num)
+
+-- s	-> Base10 string
+-- num  -> string length to extend to
+
+local n
+
+	if (num == nil) then
+		n = 0
+	else
+		n = num
+	end
+
+	s = string.format("%x", s)
+
+	s = Hex2Bin(s)
+
+	while string.len(s) < n do
+		s = "0"..s
+	end
+
+	return s
+
+end
+
+
+
+
+function Hex2Dec(s)
+
+-- s	-> hexadecimal string
+
+local s = Hex2Bin(s)
+
+	return Bin2Dec(s)
+
+end
+
+
+
+function Dec2Hex(s)
+
+-- s	-> Base10 string
+
+	s = string.format("%x", s)
+
+	return s
+
+end
+
+
+
+
+-- These functions are big-endian and will extend to 32 bits
+
+-- BMAnd
+-- BMNAnd
+-- BMOr
+-- BMXOr
+-- BMNot
+
+
+function BMAnd(v, m)
+
+-- v	-> hex string to be masked
+-- m	-> hex string mask
+
+-- s	-> hex string as masked
+
+-- bv	-> binary string of v
+-- bm	-> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+	while (string.len(bv) < 32) do
+		bv = "0000"..bv
+	end
+
+	while (string.len(bm) < 32) do
+		bm = "0000"..bm
+	end
+
+
+	for i = 1, 32 do
+		cv = string.sub(bv, i, i)
+		cm = string.sub(bm, i, i)
+		if cv == cm then
+			if cv == "1" then
+				s = s.."1"
+			else
+				s = s.."0"
+			end
+		else
+			s = s.."0"
+
+		end
+	end
+
+	return Bin2Hex(s)
+
+end
+
+
+function BMNAnd(v, m)
+
+-- v	-> hex string to be masked
+-- m	-> hex string mask
+
+-- s	-> hex string as masked
+
+-- bv	-> binary string of v
+-- bm	-> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+	while (string.len(bv) < 32) do
+		bv = "0000"..bv
+	end
+
+	while (string.len(bm) < 32) do
+		bm = "0000"..bm
+	end
+
+
+	for i = 1, 32 do
+		cv = string.sub(bv, i, i)
+		cm = string.sub(bm, i, i)
+		if cv == cm then
+			if cv == "1" then
+				s = s.."0"
+			else
+				s = s.."1"
+			end
+		else
+			s = s.."1"
+
+		end
+	end
+
+	return Bin2Hex(s)
+
+end
+
+
+
+function BMOr(v, m)
+
+-- v	-> hex string to be masked
+-- m	-> hex string mask
+
+-- s	-> hex string as masked
+
+-- bv	-> binary string of v
+-- bm	-> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+	while (string.len(bv) < 32) do
+		bv = "0000"..bv
+	end
+
+	while (string.len(bm) < 32) do
+		bm = "0000"..bm
+	end
+
+
+	for i = 1, 32 do
+		cv = string.sub(bv, i, i)
+		cm = string.sub(bm, i, i)
+		if cv == "1" then
+				s = s.."1"
+		elseif cm == "1" then
+				s = s.."1"
+		else
+			s = s.."0"
+		end
+	end
+
+	return Bin2Hex(s)
+
+end
+
+function BMXOr(v, m)
+
+-- v	-> hex string to be masked
+-- m	-> hex string mask
+
+-- s	-> hex string as masked
+
+-- bv	-> binary string of v
+-- bm	-> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+	while (string.len(bv) < 32) do
+		bv = "0000"..bv
+	end
+
+	while (string.len(bm) < 32) do
+		bm = "0000"..bm
+	end
+
+
+	for i = 1, 32 do
+		cv = string.sub(bv, i, i)
+		cm = string.sub(bm, i, i)
+		if cv == "1" then
+			if cm == "0" then
+				s = s.."1"
+			else
+				s = s.."0"
+			end
+		elseif cm == "1" then
+			if cv == "0" then
+				s = s.."1"
+			else
+				s = s.."0"
+			end
+		else
+			-- cv and cm == "0"
+			s = s.."0"
+		end
+	end
+
+	return Bin2Hex(s)
+
+end
+
+
+function BMNot(v, m)
+
+-- v	-> hex string to be masked
+-- m	-> hex string mask
+
+-- s	-> hex string as masked
+
+-- bv	-> binary string of v
+-- bm	-> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+	while (string.len(bv) < 32) do
+		bv = "0000"..bv
+	end
+
+	while (string.len(bm) < 32) do
+		bm = "0000"..bm
+	end
+
+
+	for i = 1, 32 do
+		cv = string.sub(bv, i, i)
+		cm = string.sub(bm, i, i)
+		if cm == "1" then
+			if cv == "1" then
+				-- turn off
+				s = s.."0"
+			else
+				-- turn on
+				s = s.."1"
+			end
+		else
+			-- leave untouched
+			s = s..cv
+
+		end
+	end
+
+	return Bin2Hex(s)
+
+end
+
+
+-- these functions shift right and left, adding zeros to lost or gained bits
+-- returned values are 32 bits long
+
+-- BShRight(v, nb)
+-- BShLeft(v, nb)
+
+
+function BShRight(v, nb)
+
+-- v	-> hexstring value to be shifted
+-- nb	-> number of bits to shift to the right
+
+-- s	-> binary string of v
+
+local s = Hex2Bin(v)
+
+	while (string.len(s) < 32) do
+		s = "0000"..s
+	end
+
+	s = string.sub(s, 1, 32 - nb)
+
+	while (string.len(s) < 32) do
+		s = "0"..s
+	end
+
+	return Bin2Hex(s)
+
+end
+
+function BShLeft(v, nb)
+
+-- v	-> hexstring value to be shifted
+-- nb	-> number of bits to shift to the right
+
+-- s	-> binary string of v
+
+local s = Hex2Bin(v)
+
+	while (string.len(s) < 32) do
+		s = "0000"..s
+	end
+
+	s = string.sub(s, nb + 1, 32)
+
+	while (string.len(s) < 32) do
+		s = s.."0"
+	end
+
+	return Bin2Hex(s)
+
+end

mote/v2/openwrt/package/flukso/luasrc/flukso/spi.lua

@@ -0,0 +1,210 @@
+--[[
+    
+    spi.lua - Lua 5.1 flukso module for spidev message processing
+
+    Copyright (C) 2011 Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+]]--
+
+local nixio = require 'nixio'
+local BinDecHex = require 'flukso.BinDecHex'
+
+local os, table, string =
+      os, table, string
+
+local getfenv, setmetatable, tonumber =
+      getfenv, setmetatable, tonumber
+
+module (...)
+local modenv = getfenv()
+
+-- private
+local function dow_crc(sequence, crc)
+	crc = crc or 0x00
+
+	local r1 = { 0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83,
+                     0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41 }
+
+	local r2 = { 0x00, 0x9d, 0x23, 0xbe, 0x46, 0xdb, 0x65, 0xf8,
+                     0x8c, 0x11, 0xaf, 0x32, 0xca, 0x57, 0xe9, 0x74 }
+
+	local first_char = sequence:sub(1, 1)
+
+	if first_char ~= '' then
+		local i = nixio.bit.band(nixio.bit.bxor(first_char:byte(), crc), 0xff)
+		crc = nixio.bit.bxor(r1[nixio.bit.band(i, 0xf) + 1], r2[nixio.bit.rshift(i, 4) + 1])
+		return dow_crc(sequence:sub(2, -1), crc)
+	else
+		return nixio.bin.hexlify(string.char(crc))
+	end
+end
+
+--- Create a new spi message object.
+--
+-- Attributes:
+-- { to = ctrl | delta | uart
+--   body = <string>
+--   parsed = { <command>, <arg1>, <arg2>, ... }
+--   encoded = <string>
+--   received = { raw = <string>, l = <string>, crc = <string>, u = <string> }
+--   decoded = { l = ..., u = ... }
+--   reply = <string>
+-- }
+--
+-- @param  to   The message destination: ctrl | delta | uart.
+-- @param  body The message body.
+-- @return An spi message object.
+function new_msg(to, body)
+	return setmetatable({ to = to, body = body }, { __index = modenv })
+end
+
+function parse(msg)
+	msg.parsed = {}
+
+	msg.parsed[1] = msg.body:match('^%l%l')
+	for arg in msg.body:gmatch('%d+') do
+		msg.parsed[#msg.parsed + 1] = arg
+	end
+
+	--> TODO: more detailed command syntax checking
+end
+
+function encode(msg)
+	if msg.to == 'uart' then
+		msg.encoded = nixio.bin.hexlify(msg.body)
+		return
+	end
+
+	if msg.parsed[1] == 'gd' then
+		msg.encoded = msg.parsed[1]
+	elseif msg.parsed[1] == 'gv' then
+
+	elseif msg.parsed[1] == 'gp' then
+        
+	elseif msg.parsed[1] == 'gc' then
+        
+	elseif msg.parsed[1] == 'gm' then
+
+	elseif msg.parsed[1] == 'gw' then
+
+	elseif msg.parsed[1] == 'gb' then
+
+	elseif msg.parsed[1] == 'sv' then
+
+	elseif msg.parsed[1] == 'sp' then
+
+	elseif msg.parsed[1] == 'sc' then
+
+	elseif msg.parsed[1] == 'sm' then
+
+	elseif msg.parsed[1] == 'sw' then
+
+	elseif msg.parsed[1] == 'sb' then
+
+	elseif msg.parsed[1] == 'ct' then
+
+	else
+
+	end
+
+--> TODO msg.encoded = msg.encoded .. dow_crc(msg.encoded)
+end
+
+function tx(msg, cdev)
+	if msg.to == 'ctrl' or msg.to == 'delta' then
+		cdev:write('l' .. msg.encoded .. '.\0\0')
+	elseif msg.to == 'uart' then
+		cdev:write('u' .. msg.encoded .. '\0\0')
+	end
+end
+
+function rx(msg, cdev)
+	local sequence = {}
+
+	for char in function() return cdev:read(1) end do
+		if char ~= '\0' then
+			table.insert(sequence, char)
+		else
+        	        -- one more read to let the AVR send a second 0x00
+			-- after which the AVR's state machine toggles to read mode
+			cdev:read(1)
+			break
+		end
+	end
+
+	msg.received = {}
+	msg.received.raw = table.concat(sequence)
+	msg.received.l, msg.received.u = msg.received.raw:match('^l(%w*)%.?u(%w*)%.?$')
+
+	if msg.received.l ~= '' and msg.received.l:sub(1, 2) == msg.parsed[1] then
+		msg.received.crc = msg.received.l:sub(-2, -1)
+		msg.received.l   = msg.received.l:sub(1, -3)
+
+		if dow_crc(msg.received.l) ~= msg.received.crc then
+			--> TODO implement crc error counter
+			msg.received.l = ''
+		end
+	end
+end
+
+function decode(msg)
+	msg.decoded = {}
+
+	if msg.received.u ~= '' then
+		msg.decoded.u = nixio.bin.unhexlify(msg.received.u)
+	end
+
+	if msg.received.l ~= '' then
+		msg.decoded.largs = msg.received.l:sub(3, -1)
+
+		if msg.parsed[1] == 'gd' then
+			for i = 1, msg.decoded.largs:len() / 18 do
+				msg.decoded[(i-1)*3 + 1] =
+					tonumber(BinDecHex.Hex2Dec(msg.decoded.largs:sub((i-1)*18 +  1, (i-1)*18 +  2)))
+				msg.decoded[(i-1)*3 + 2] =
+					tonumber(BinDecHex.Hex2Dec(msg.decoded.largs:sub((i-1)*18 +  3, (i-1)*18 + 10)))
+				msg.decoded[(i-1)*3 + 3] =
+					tonumber(BinDecHex.Hex2Dec(msg.decoded.largs:sub((i-1)*18 + 11, (i-1)*18 + 18)))
+			end
+		elseif msg.parsed[1] == 'gv' then
+
+		elseif msg.parsed[1] == 'gp' then
+
+		elseif msg.parsed[1] == 'gc' then
+
+		elseif msg.parsed[1] == 'gm' then
+
+		elseif msg.parsed[1] == 'gw' then
+
+		elseif msg.parsed[1] == 'gb' then
+
+		elseif msg.parsed[1] == 'sv' then
+
+		elseif msg.parsed[1] == 'sp' then
+
+		elseif msg.parsed[1] == 'sc' then
+
+		elseif msg.parsed[1] == 'sm' then
+
+		elseif msg.parsed[1] == 'sw' then
+
+		elseif msg.parsed[1] == 'sb' then
+
+		elseif msg.parsed[1] == 'ct' then
+
+		end
+	end
+end

mote/v2/openwrt/package/flukso/luasrc/fluksod.lua

@@ -0,0 +1,78 @@
+#! /usr/bin/env lua
+
+--[[
+    
+    fluksod.lua - Lua part of fluksod
+
+    Copyright (C) 2011 Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+]]--
+
+require 'dbg'
+require 'nixio'
+require 'nixio.fs'
+local spi = require 'flukso.spi'
+
+DAEMON      = os.getenv('DAEMON') or 'fluksod'
+DAEMON_PATH = os.getenv('DAEMON_PATH') or '/var/run/' .. DAEMON
+
+O_RDWR_NONBLOCK = nixio.open_flags('rdwr', 'nonblock')
+POLLIN          = nixio.poll_flags('in')
+
+function mkfifos(input)
+	local path = string.format('%s/%s/', DAEMON_PATH, input) 
+
+	nixio.fs.mkdirr(path)
+	nixio.fs.unlink(path .. 'in')  --> clean up mess from previous run
+	nixio.fs.unlink(path .. 'out') --> idem
+	nixio.fs.mkfifo(path .. 'in', '644')
+	nixio.fs.mkfifo(path .. 'out', '644')
+
+	local fdin  = nixio.open(path .. 'in', O_RDWR_NONBLOCK)
+	local fdout = nixio.open(path .. 'out', O_RDWR_NONBLOCK)
+
+	return { fd      = fdin, --> need this entry for nixio.poll
+                 fdin    = fdin,
+                 fdout   = fdout,
+                 events  = POLLIN,
+                 revents = 0,
+                 line    = fdin:linesource() }
+end
+
+local uart  = mkfifos('uart')
+local ctrl  = mkfifos('ctrl')
+local delta = mkfifos('delta')
+
+local fds = { uart, ctrl, delta }
+
+local spidev = nixio.open('/dev/spidev0.0', O_RDWR_NONBLOCK)
+
+while true do
+	if nixio.poll(fds, -1) then
+		if delta.revents == POLLIN then
+			--> TODO flush the delta fd after each POLLIN
+			local msg = spi.new_msg('delta', delta.line())
+			msg:parse()
+			msg:encode()
+			msg:tx(spidev)
+			nixio.nanosleep(0, 10e7) --> 10ms
+			msg:rx(spidev)
+			msg:decode()
+			--> dbg.vardump(msg)
+			delta.fdout:write(msg.parsed[1] .. ' ' .. table.concat(msg.decoded, ' ') .. '\n')
+		end
+	end
+end

mote/v2/openwrt/package/flukso/luasrc/spi/spid.lua

@@ -1,60 +0,0 @@
-#! /usr/bin/env lua
-
---[[
-    
-    spid.lua - Lua part of the spi daemon
-
-    Copyright (C) 2011 Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
-
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-]]--
-
-
-require 'nixio.fs'
-
-ctrl_path = os.getenv('DAEMON_PATH') .. '/ctrl/'  
-
-nixio.fs.mkdirr(ctrl_path)
-nixio.fs.unlink(ctrl_path .. 'in')
-nixio.fs.unlink(ctrl_path .. 'out')
-
-nixio.fs.mkfifo(ctrl_path .. 'in', '644')
-nixio.fs.mkfifo(ctrl_path .. 'out', '644')
-
-rdwr_nonblock = nixio.open_flags('rdwr', 'nonblock')
-
-ctrl_fd_in = nixio.open(ctrl_path .. 'in', rdwr_nonblock)
-ctrl_fd_out = nixio.open(ctrl_path .. 'out', rdwr_nonblock)
-
-pfin = nixio.poll_flags('in')
-
-local fd = {fd      = ctrl_fd_in,
-            events  = pfin,
-            revents = 0}
-            
-local fds = {fd}
-                        
-ctrl_line = ctrl_fd_in:linesource()
-
-while true do
-	if nixio.poll(fds, 1000) then
-		ctrl_fd_out:write((ctrl_line() or 'nil!') .. '\n')
-	else
-		ctrl_fd_out:write('timeout\n')	
-	end	
-end
-
-nixio.fs.unlink(ctrl_path .. 'in') 
-nixio.fs.unlink(ctrl_path .. 'out')