fix: serial device name

heartbeat.rules

@@ -1,2 +1,2 @@
 # should be in /etc/udev/rules.d/
-ACTION=="add", ATTRS{idProduct}=="7523", ATTRS{idVendor}=="1a86", NAME="heartbeat-listener"
+ACTION=="add", ATTRS{idProduct}=="7523", ATTRS{idVendor}=="1a86", NAME="heartbeat"

src/main.rs

@@ -4,7 +4,7 @@ use serialport::SerialPort;
 
 const HEARTBEAT_INTERVAL: Duration = Duration::from_secs(5);
 const HEARTBEAT_MESSAGE: &str = "OK";
-const WATCHDOG_DEVICE: &str = "/dev/watchdog0";
+const WATCHDOG_DEVICE: &str = "/dev/heartbeat";
 
 
 fn main() {