Actually use unique client id

controller-host/main.lua

@@ -137,7 +137,7 @@ function love.load()
 	local requirePaths = love.filesystem.getRequirePath()
 	love.filesystem.setRequirePath(requirePaths .. ";client/?.lua;client/?/init.lua")
 	local mqttThread = love.thread.newThread("mqttthread.lua")
-	mqttThread:start()
+	mqttThread:start(love.math.random(0, 999999))
 	mqttEventChannel = love.thread.getChannel("mqtt_event")
 	mqttCommandChannel = love.thread.getChannel("mqtt_command")
 end

controller-host/mqttthread.lua

@@ -2,6 +2,8 @@
 local mqtt = require("mqtt")
 local client
 
+local maxClientId = ...
+
 local eventChannel = love.thread.getChannel("mqtt_event")
 local commandChannel = love.thread.getChannel("mqtt_command")
 
@@ -46,7 +48,7 @@ end
 local function main()
 	client = mqtt.client {
 		uri = "mqtt.seeseepuff.be",
-		username = "mqtt_controller-" .. math.random(0, 999999999),
+		username = "mqtt_controller-" .. math.random(0, maxClientId),
 		clean = true,
 		reconnect = 5,
 	}