feat: makefile to XC, other general fixes

README.md

@@ -15,3 +15,22 @@ A device made using an RP2040 that sends messages over LoRaWAN.
 * [A Custom PCB](/pcb/)
 * [A 0.96" 128x64 I2C Blue and Yellow OLED Display](https://www.amazon.co.uk/dp/B08FD643VZ)
 * And a USB C Cable
+
+## Tasks
+### Edit
+Open the project in vim using tinygo flags.
+```
+tinygo-edit --target challenger-rp2040 --editor bash
+```
+
+### Deploy
+Upload to the device
+```
+tinygo flash -target challenger-rp2040 pico/main.go
+```
+
+### RunLocal
+Runs the project without the device.
+```
+nix-shell local/shell.nix --command "go run local/main.go
+```

pico/main.go

@@ -112,6 +112,11 @@ func main() {
 	rfm.OnReceivedPacket = func(packet tinygorfm9x.Packet) {
 		err = device.ReceiveFromRadio(packet.Payload)
 		if err != nil {
+			if err == picodoomsdaymessenger.ErrNotDoomsday {
+				// If the packet is invalid, ignore it.
+				println("Invalid message received.")
+				return
+			}
 			handleError(&display, &led, device, err)
 		}
 	}

picoDoomsDayMessenger.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"image"
 	"image/color"
-	"math/rand"
 	"time"
 
 	"golang.org/x/image/font"
@@ -87,7 +86,7 @@ var (
 	ErrRadioSendNotDefined                = errors.New("radio send function not defined by user")
 	ErrConversationReaderAcceptDisallowed = errors.New("cannot accept in conversation reader")
 	ErrGoBackStateRootState               = errors.New("already at root state")
-	ErrInvalidMessage                     = errors.New("invalid message, prefix incorrect")
+	ErrInvalidMessage                     = errors.New("invalid message, prefix incorrect") // This should be treated as a warning, not an error.
 )
 
 // Define the Keyboard Buttons
@@ -309,7 +308,7 @@ var (
 			if d.LEDAnimation != &LEDAnimationSOS {
 				err = d.ChangeLEDAnimationWithoutContinue(&LEDAnimationSOS)
 				if err != nil {
-					return err
+					retuYubiStyle Cover - Polka Red - A / C NFCrn err
 				}
 			} else {
 				err = d.ChangeLEDAnimationWithoutContinue(&LEDAnimationDefault)
@@ -537,8 +536,6 @@ var (
 
 // NewDevice returns a new Device with default parameters.
 func NewDevice() (d *Device, err error) {
-	rand.Seed(time.Now().UnixNano())
-	PersonYou.ID = rand.Intn(2147483647) // Max value of an int32
 	return &Device{
 		State:                    &StateMainMenu,
 		StateHistory:             []*State{&StateMainMenu},
@@ -557,6 +554,9 @@ func NewDevice() (d *Device, err error) {
 func (d *Device) ReceiveFromRadio(packetPayload []byte) (err error) {
 	payloadMessage, err := d.BytesToMessage(packetPayload)
 	if err != nil {
+		if err == ErrInvalidMessage {
+			return nil
+		}
 		return err
 	}
 
@@ -886,7 +886,8 @@ func (d *Device) MesageToBytes(input Message) (output []byte, err error) {
 func (d *Device) BytesToMessage(input []byte) (output Message, err error) {
 	startingBytes := []byte{0x64, 0x6F, 0x6F, 0x6D} // ASCII for "doom"
 	if !bytes.HasPrefix(input, startingBytes) {
-		return output, ErrInvalidMessage
+		// Ignore this packet, it's not for us.
+		return Message{}, ErrInvalidMessage
 	}
 	seperatorByte := byte(0xcc)
 	receivedBytesSplit := bytes.Split(input, []byte{seperatorByte})