Better error handling

controller-client/main.lua

@@ -1,3 +1,22 @@
+local lastMessage = 0
+
 function love.draw2()
-	love.graphics.setBackgroundColor(0, 1, 0)
+	love.graphics.setBackgroundColor(0, 0, 0)
+
+	local time
+	if lastMessage == 0 then
+		time = "Never"
+	else
+		time = love.timer.getTime() - time "s ago"
+	end
+	love.graphics.print("Last message received: " .. time, 5, 5)
+end
+
+function love.load()
+	love.graphics.setFont(love.graphics.newFont(15))
+	love.window.setFullscreen(true)
+end
+
+function love.gamepadpressed(joystick, button)
+	print("Pressed gamepad button " .. button .. " on joystick " .. joystick:getName())
 end

controller-host/conf.lua

@@ -2,4 +2,5 @@ function love.conf(t)
 	t.version = "11.4"
 	t.window.title = "Spider Controller"
 	t.window.resizable = true
+	t.window.fullscreen = true
 end

controller-host/main.lua

@@ -19,9 +19,16 @@ function printTable(table, indentation)
 	end
 end
 
+function safeCall(target, ...)
+	local success, msg = pcall(target, ...)
+	if not success then
+		errorMessage = msg
+	end
+end
+
 function love.draw(...)
-	if love.draw2 then
-		love.draw2(...)
+	if love.draw2 and not errorMessage then
+		safeCall(love.draw2, ...)
 	else
 		local text = "Awaiting payload..."
 		local font = love.graphics.getFont()
@@ -58,11 +65,11 @@ end
 function love.update(...)
 	local message = mqttEventChannel:pop()
 	if message then
-		love.mqtt[message.target](unpack(message.args))
+		safeCall(love.mqtt[message.target], unpack(message.args))
 	end
 
-	if love.update2 then
-		love.update2(...)
+	if love.update2 and not errorMessage then
+		safeCall(love.update2, ...)
 	end
 end
 
@@ -78,6 +85,7 @@ end
 
 function love.mqtt.message2(topic, payload)
 	if topic == "controller/payload" then
+		errorMessage = nil
 		local success = love.filesystem.unmount("client.zip")
 		if not success then
 			print("Could not unmount client.zip")
@@ -98,7 +106,7 @@ function love.mqtt.message2(topic, payload)
 		love.load = nil
 		chunk()
 		if love.load then
-			love.load()
+			safeCall(love.load)
 		end
 	elseif love.mqtt.message then
 		love.mqtt.message(topic, payload)

sim.lua

@@ -0,0 +1,54 @@
+package.path = package.path .. ';./controller-host/?/init.lua;./controller-host/?.lua'
+local mqtt = require("mqtt")
+local client
+
+local file = ...
+local fh = io.open(file, "rb")
+local contents = fh:read("a")
+fh:close()
+
+function printTable(table, indentation)
+	indentation = indentation or ""
+	for name, value in pairs(table) do
+		print(indentation .. tostring(name) .. ": " .. tostring(value))
+	end
+end
+
+local function onMessage(data)
+	print(data.payload)
+end
+
+local function onConnect(connack)
+	if connack.rc ~= 0 then
+		print("Connection to broker failed:", connack:reason_string())
+		os.exit(1)
+	end
+	print("Connected to MQTT")
+
+	assert(client:subscribe{
+		topic = "spider/controller/stdout"
+	})
+	
+	io.write("Sending payload...")
+	assert(client:publish {
+		topic = "spider/controller/payload",
+		payload = contents,
+		qos = 0
+	})
+	print(" DONE!")
+end
+
+client = mqtt.client {
+	uri = "mqtt.seeseepuff.be",
+	username = "mqtt_controller",
+	clean = true,
+	reconnect = 5,
+}
+
+client:on {
+	connect = onConnect,
+	message = onMessage,
+}
+
+print("Connecting")
+mqtt.run_ioloop(client)