implemented mocking of rpi hardware

buzzer,led & hotspot got traits and a mock version of it. Based on the
flag the real or mock version is used.

src/mock.rs

@@ -0,0 +1,45 @@
+use log::debug;
+
+use crate::{buzzer::Buzzer, hotspot::Hotspot, led::StatusLed};
+
+pub struct MockBuzzer {}
+
+impl Buzzer for MockBuzzer {
+    async fn beep_ack(&mut self) -> Result<(), rppal::pwm::Error> {
+        debug!("Mockbuzzer: ACK");
+        Ok(())
+    }
+
+    async fn beep_nak(&mut self) -> Result<(), rppal::pwm::Error> {
+        debug!("Mockbuzzer: NAK");
+        Ok(())
+    }
+}
+
+pub struct MockLed {}
+
+impl StatusLed for MockLed {
+    async fn turn_green_on_1s(&mut self) -> Result<(), rppal::spi::Error> {
+        debug!("Mockled: Turn LED green for 1 sec");
+        Ok(())
+    }
+
+    async fn turn_red_on_1s(&mut self) -> Result<(), rppal::spi::Error> {
+        debug!("Mockled: Turn LED red for 1 sec");
+        Ok(())
+    }
+}
+
+pub struct MockHotspot {}
+
+impl Hotspot for MockHotspot {
+    async fn enable_hotspot(&self) -> Result<(), crate::hotspot::HotspotError> {
+        debug!("Mockhotspot: Enable hotspot");
+        Ok(())
+    }
+
+    async fn disable_hotspot(&self) -> Result<(), crate::hotspot::HotspotError> {
+        debug!("Mockhotspot: Disable hotspot");
+        Ok(())
+    }
+}