From b9f9a9fc7ce27ab091e2bd0fd156e19c568e8b71 Mon Sep 17 00:00:00 2001
From: LDDestroier <etheilig02@gmail.com>
Date: Thu, 13 Feb 2020 00:34:17 -0500
Subject: [PATCH] Create brednet.lua

---
 brednet.lua | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 brednet.lua

diff --git a/brednet.lua b/brednet.lua
new file mode 100644
index 0000000..df50d21
--- /dev/null
+++ b/brednet.lua
@@ -0,0 +1,88 @@
+-- brednet - better rednet
+-- if you're going to be using rednet, at least use this
+
+local brednet = {}
+
+ccemux.attach("top", "wireless_modem")
+
+-- stores the last 1000 received messages
+local USED = {}
+
+local cycleIntoUsed = function(id)
+	USED[id] = 1000
+	for k,v in pairs(USED) do
+		if v == 0 then
+			USED[k] = nil
+		else
+			USED[k] = -1 + v
+		end
+	end
+end
+
+brednet.open = function(CHANNEL, MODEMS)
+	local session = {
+		channel = CHANNEL or 65530,
+		modems = MODEMS or {},
+	}
+
+	-- make virtual modem that is, in fact, every modem in the list
+	session.modem = {}
+	local modem = session.modem
+	for k,v in next, {"open", "close", "transmit"} do
+		local list = (#session.modems ~= 0) and sessions.modems or {peripheral.find("modem")}
+		modem[v] = function(...)
+			for i = 1, #list do
+				list[i][v](...)
+			end
+		end
+	end
+
+	session.send = function(message, channel)
+		local msgID = math.random(1, 2^31-1)
+		cycleIntoUsed(msgID)
+		modem.transmit(
+			channel or session.channel,
+			channel or session.channel,
+			{
+				msg = message,
+				id = msgID,
+				time = os.time()
+			}
+		)
+	end
+
+	session.parse = function(input)
+		-- check types
+		if type(input) == "table" then
+			if type(input.id) == "number" and input.msg then
+				if not USED[input.id] then
+					return input.id, input.msg
+				end
+			end
+		end
+	end
+
+	session.receive = function()
+		local evt, output = {}
+		while not session.parse(evt[5]) do
+			evt = {os.pullEvent("modem_message")}
+		end
+		cycleIntoUsed(evt[5].id)
+		modem.transmit(
+			channel or session.channel,
+			channel or session.channel,
+			{
+				msg = evt[5].msg,
+				id = evt[5].id,
+				time = evt[5].time,
+			}
+		)
+		return evt[5].id, evt[5].msg
+	end
+
+	modem.open(session.channel)
+
+	return session
+end
+
+return brednet