updated

server/chat-server.lua

@@ -0,0 +1,51 @@
+local modem = peripheral.find("modem")
+local SERVER_PORT = 100
+local CLIENT_PORT = 101
+
+local function log(msg)
+    print("[Server]: " .. tostring(msg))
+end
+
+local function broadcast(message)
+    if modem then
+        modem.transmit(CLIENT_PORT, SERVER_PORT, message)
+    end
+end
+
+local function handleMessage(event, side, channel, replyChannel, message, distance)
+    if type(message) == "table" then
+        if message.type == "join" then
+            log(message.username .. " connected.")
+            broadcast({ type = "system", content = message.username .. " joined the chat." })
+        elseif message.type == "leave" then
+            log(message.username .. " disconnected.")
+            broadcast({ type = "system", content = message.username .. " left the chat." })
+        elseif message.type == "chat" then
+            log(message.username .. ": " .. message.content)
+            broadcast({ type = "chat", username = message.username, content = message.content })
+        end
+    end
+end
+
+local function listenLoop()
+    if not modem then
+        log("No modem found!")
+        return
+    end
+    modem.open(SERVER_PORT)
+    log("Listening on port " .. SERVER_PORT)
+    
+    while true do
+        local eventData = {os.pullEvent("modem_message")}
+        -- event, side, channel, replyChannel, message, distance
+        if eventData[3] == SERVER_PORT then
+            handleMessage(table.unpack(eventData))
+        end
+    end
+end
+
+local function main()
+    parallel.waitForAll(listenLoop)
+end
+
+return { main = main }