Initial commit

.gitignore

@@ -0,0 +1,2 @@
+secrets.h
+

Makefile

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+compile:
+	arduino-cli compile --fqbn arduino:samd:mkrwifi1010
+
+run: compile
+	sudo arduino-cli upload --fqbn arduino:samd:mkrwifi1010 --port /dev/ttyACM0
+	sudo cat /dev/ttyACM0
+

h3-arduino.ino

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+#include <Arduino_MKRIoTCarrier.h>
+#include <WiFiNINA.h>
+#include <ArduinoMqttClient.h>
+
+#include "secrets.h"
+
+MKRIoTCarrier carrier;
+WiFiSSLClient wifi_client;
+MqttClient mqtt_client(wifi_client);
+
+extern const char *wifi_ssid;
+extern const char *wifi_password;
+
+extern const char *mqtt_server;
+extern const char *mqtt_username;
+extern const char *mqtt_password;
+
+void setup(void)
+{
+	Serial.begin(9600);
+
+	Serial.println("Started");
+
+	carrier.begin();
+	carrier.display.init(240, 240);
+
+	pinMode(TFT_BACKLIGHT, OUTPUT);
+	digitalWrite(TFT_BACKLIGHT, HIGH);
+
+	Serial.println("Connecting to WiFi");
+
+	WiFi.begin(wifi_ssid, wifi_password);
+	while (WiFi.status() != WL_CONNECTED) {
+    Serial.print(".");
+		delay(1000);
+	}
+
+	Serial.println("Connected to WiFi");
+	
+	mqtt_client.setUsernamePassword(mqtt_username, mqtt_password);
+	if (!mqtt_client.connect(mqtt_server, 8883)) {
+		Serial.print("MQTT connection failed with error code: ");
+		Serial.println(mqtt_client.connectError());
+		return;
+	}
+
+	Serial.println("Connected to MQTT");
+	
+	mqtt_client.subscribe("display");
+
+	carrier.display.setCursor(50, 20);
+	carrier.display.setTextSize(4);
+	carrier.display.print("Waiting");
+}
+
+void loop(void)
+{
+	int message_size = mqtt_client.parseMessage();
+	if (message_size) {
+		char *message = (char *)malloc(message_size + 1);
+		
+		for (int i = 0; i < message_size && mqtt_client.available(); i++) {
+			message[i] = (char)mqtt_client.read();
+		}
+		message[message_size] = '\0';
+		
+		Serial.print("Got message: ");
+		Serial.println(message);
+		
+		carrier.display.fillScreen(0x000);
+		carrier.display.setCursor(50, 20);
+		carrier.display.setTextSize(4);
+		carrier.display.print(message);
+		
+		free(message);
+	}
+}
+