Minor: Made companion more resilent from USB problems on Raspbey pi 3…

…, as discussed in #313

lib/usb/elgato.js

@@ -147,21 +147,29 @@ elgato.prototype.quit = function () {
 	}
 };
 
-elgato.prototype.draw = function(key, buffer) {
+elgato.prototype.draw = function(key, buffer, attempts) {
 	var self = this;
 
-	try {
-		key = self.mapButton(key);
+	// null/undefined => 0
+	attempts = ~~attempts;
 
-		if (key >= 0 && !isNaN(key)) {
-			buffer = self.handleBuffer(buffer);
-			self.streamDeck.fillImage(key, buffer);
-		}
-	} catch (e) {
-		self.system.emit('elgatodm_remove_device', self.devicepath);
+	if(!attempts){
+		buffer = self.handleBuffer(buffer);
 	}
+	attempts++;
 
-	return true;
+	try {
+		self.streamDeck.fillImage(self.reverseButton(key), buffer);
+		return true;
+	} catch (e) {
+		if(attempts > 2) {
+			self.log('Error drawing:', e);
+			self.system.emit('elgatodm_remove_device', self.devicepath);
+			return false;
+		}
+		setTimeout(self.draw.bind(self), 20, key, buffer, attempts)
+		// alternatively a setImmediate() or nextTick()
+	}
 }
 
 elgato.prototype.isPressed = function(key) {