Minor cleanup

storage-net/README.md

@@ -14,9 +14,7 @@ The master node must have a modem attached and be within range of all slave node
 
 ## Communication Protocol
 
-Port 42914 is used for Master => Slave broadcasting
-
-Port 42915 is used for Slave => Master return broadcasting
+Messages are sent over rednet with the protocol `ccstoragenet`.
 
 ### Packet Format
 
@@ -52,17 +50,15 @@ Packet format is uniform between master <-> slaves and is structured like so:
 | `itemquant` | false | int | Quantity of the aforementioned item |
 | `destination` | false | int | The CC ID of the intended recipient of the item |
 
-Messages are sent over rednet with the protocol `ccstoragenet`.
-
 ### Slave Node Initialization
 
-* The slave starts up
+* The slave starts up and immediately listens for messages
 
 ### Master Node Initialization
 
 * The master node starts up
 * The master node sends a packet with type `ping`.
-* The master node listens for `pong` packets for a configurable timeout.
+* The master node listens for `pong` packets from all slaves.
 * The `sourceid` of all `pong` packets is recorded for statistics displays. This cached data is only used for user display. Node availability is evaluated at request time.
 
 ### Inventory Search (query)

storage-net/common.lua

@@ -22,6 +22,7 @@ print("Computer " .. os.getComputerID() .. " configured as " .. mode)
 modem = peripheral.find("modem") or error("No modem attached", 0)
 modem_side = peripheral.getName(modem)
 -- Master globals
+m_slaves = {}
 -- Slave globals
 
 -- Common functions
@@ -36,11 +37,11 @@ function c_waitForMessage()
     local sender, message = rednet.receive(packet_magic, 1)
     if message then
         if
-            (not message["type"]) or                    -- Message type is required
-            (message["sourcetype"] == mode) or          -- Ignore packets from our class of machines
-            (message["networkid"] ~= networkid)         -- Ignore packets from other networks
+            (not message["type"]) or                                            -- Message type is required
+            (message["sourcetype"] == mode) or                                  -- Ignore packets from our class of machines
+            (message["networkid"] ~= networkid) or                              -- Ignore packets from other networks
+            (message["targetid"] and message["targetid"] ~= os.getComputerID)   -- Ignore packets for other machines
         then
-            print("Discarded nonconformant message")
             return nil
         end
         return message
@@ -58,7 +59,7 @@ function c_sendMessage(message)
     for k,v in pairs(message) do
         msg[k] = v
     end
-    print("Transmitting message: " .. textutils.serialize(msg))
+    --print("Transmitting message: " .. textutils.serialize(msg))
     rednet.broadcast(msg, packet_magic)
 end
 
@@ -71,9 +72,18 @@ function m_loop()
         return
     end
     if msg["type"] == "pong" then
-        print("Received pong from slave: " .. msg["sourceid"])
+        local source = msg["sourceid"]
+        print("Received pong from slave: " .. source)
+        m_slaves[source] = source
     end
 end
+function m_ping()
+    -- Clear out the list of all slaves and send out a fresh ping
+    -- Ping information isn't used for much, so delay in clearing cache and
+    -- repopulating the data isn't a big deal.
+    m_slaves = {}
+    c_sendMessage({type="ping"})
+end
 
 -- Slave functions
 function s_loop()
@@ -99,7 +109,7 @@ function main ()
         rednet.open(modem_side)
 
         print("Pinging for slaves...")
-        c_sendMessage({type="ping"})
+        m_ping()
 
         print("Entering main loop")
         c_mainLoop(m_loop)