Add client dropper discovery and announcement functionality

inventoryClient.lua

@@ -18,6 +18,8 @@ local SMELTER_MONITOR_SIDE = "top"
 local CLIENT_DROPPER_NAME = ""    -- e.g. "minecraft:dropper_5"
 local CLIENT_BARREL_NAME  = ""    -- e.g. "minecraft:barrel_3"
 
+local DROPPER_ANNOUNCE_INTERVAL = 30  -- seconds between dropper announcements
+
 -------------------------------------------------
 -- State (received from master)
 -------------------------------------------------
@@ -312,6 +314,53 @@ local function sendToMaster(message)
     networkModem.transmit(ORDER_CHANNEL, CLIENT_CHANNEL, message)
 end
 
+-------------------------------------------------
+-- Client dropper discovery
+-------------------------------------------------
+
+local function discoverLocalDroppers()
+    local droppers = {}
+    -- Check configured dropper first
+    if CLIENT_DROPPER_NAME ~= "" then
+        local exists = peripheral.wrap(CLIENT_DROPPER_NAME) ~= nil
+        if exists then
+            table.insert(droppers, { name = CLIENT_DROPPER_NAME, isDefault = false, clientId = os.getComputerID() })
+        end
+    end
+    -- Also discover any other droppers on client's local network
+    for _, name in ipairs(peripheral.getNames()) do
+        local isDropper = name:match("^minecraft:dropper_")
+        if not isDropper and peripheral.hasType then
+            isDropper = peripheral.hasType(name, "minecraft:dropper")
+        end
+        if not isDropper then
+            isDropper = peripheral.getType(name) == "minecraft:dropper"
+        end
+        if isDropper then
+            -- Avoid duplicates with configured dropper
+            local isDuplicate = false
+            for _, d in ipairs(droppers) do
+                if d.name == name then isDuplicate = true; break end
+            end
+            if not isDuplicate then
+                table.insert(droppers, { name = name, isDefault = false, clientId = os.getComputerID() })
+            end
+        end
+    end
+    return droppers
+end
+
+local function announceDroppers()
+    local droppers = discoverLocalDroppers()
+    if #droppers > 0 then
+        sendToMaster({
+            type     = "register_droppers",
+            clientId = os.getComputerID(),
+            droppers = droppers,
+        })
+    end
+end
+
 -------------------------------------------------
 -- Inventory Dashboard (identical to master)
 -------------------------------------------------
@@ -1384,7 +1433,18 @@ local function main()
             end
         end,
 
-        -- Task 4: Client barrel auto-sort (sends to master only when barrel has items)
+        -- Task 4: Announce local droppers to master periodically
+        function()
+            -- Initial announcement after short delay
+            sleep(3)
+            pcall(announceDroppers)
+            while true do
+                sleep(DROPPER_ANNOUNCE_INTERVAL)
+                pcall(announceDroppers)
+            end
+        end,
+
+        -- Task 5: Client barrel auto-sort (sends to master only when barrel has items)
         function()
             if CLIENT_BARREL_NAME == "" then return end
             print("[OK]   Client barrel: " .. CLIENT_BARREL_NAME)
@@ -1400,7 +1460,7 @@ local function main()
             end
         end,
 
-        -- Task 5: Touch event listener (both monitors)
+        -- Task 6: Touch event listener (both monitors)
         function()
             while true do
                 local event, side, x, y = os.pullEvent("monitor_touch")