Added msg command for http server

src/main.rs

@@ -15,8 +15,6 @@ use embedded_graphics::{
 };
 use embedded_hal::delay::DelayNs;
 use epd_waveshare::{color::Color, epd7in5_v2::Epd7in5, prelude::WaveshareDisplay};
-use esp_idf_hal::delay::Delay;
-use esp_idf_hal::modem::Modem;
 use esp_idf_hal::{
     delay::{Ets},
     gpio::{Gpio19, PinDriver},
@@ -193,11 +191,11 @@ fn main() -> anyhow::Result<()> {
         ..Default::default()
     })?;
 
-    let do_update = Arc::new(RwLock::new(false));
+    let do_update = Arc::new(RwLock::new(Option::<Command>::None));
     let writer = do_update.clone();
     httpserver.fn_handler("/", Method::Get, move |request| -> anyhow::Result<()> {
 
-        *writer.write().unwrap() = true;
+        *writer.write().unwrap() = Some(Command::Timetable);
 
 
         // Retrieve html String
@@ -209,25 +207,49 @@ fn main() -> anyhow::Result<()> {
         Ok(())
     })?;
 
+    let writer = do_update.clone();
+    httpserver.fn_handler("/msg", Method::Get, move |request| -> anyhow::Result<()> {
+
+        *writer.write().unwrap() = Some(Command::Message(request.header("msg").unwrap().to_string()));
+
+        // Retrieve html String
+        let html = String::from("OK");
+        // Respond with OK status
+        let mut response = request.into_ok_response()?;
+        // Return Requested Object (Index Page)
+        response.write(html.as_bytes())?;
+        Ok(())
+    })?;
+
     loop {
         delay.delay_ns(100);
 
-        if *do_update.read().unwrap(){
+        match &*do_update.read().unwrap(){
-            update_display_buffer(&mut display);
+            Some(Command::Timetable) => {
-            println!("Rendered to buffer");
+                update_display_buffer(&mut display);
-            epd7in5.wake_up(&mut spi, &mut delay)?;
+                println!("Rendered to buffer");
-            epd7in5.update_and_display_frame(&mut spi, &*display.buffer(), &mut delay)?;
+                epd7in5.wake_up(&mut spi, &mut delay)?;
-            println!("Updated frame");
+                epd7in5.update_and_display_frame(&mut spi, &*display.buffer(), &mut delay)?;
-            epd7in5.sleep(&mut spi, &mut delay)?;
+                println!("Updated frame");
-            println!("Sleep");
+                epd7in5.sleep(&mut spi, &mut delay)?;
-            unsafe {
+                println!("Sleep");
-                WAKEUP_COUNTER += 1;
+                unsafe {
-            }
+                    WAKEUP_COUNTER += 1;
+                }
+            },
+            Some(Command::Message(msg)) => {                
+                display_custom_message(&mut display, &msg);
 
-            if let Ok(mut writer) = do_update.try_write(){
+                epd7in5.wake_up(&mut spi, &mut delay)?;
-                *writer = false;
+                epd7in5.update_and_display_frame(&mut spi, &*display.buffer(), &mut delay)?;
-                println!("Successfully reset rw lock")
+                epd7in5.sleep(&mut spi, &mut delay)?;
             }
+            None => continue
+        }
+
+        if let Ok(mut writer) = do_update.try_write(){
+            *writer = Option::<Command>::None;
+            println!("Successfully reset rw lock")
         }
     }
 
@@ -249,6 +271,13 @@ fn main() -> anyhow::Result<()> {
    Ok(())
 }
 
+
+#[derive(Clone)]
+enum Command{
+    Timetable,
+    Message(String)
+}
+
 fn update_display_buffer(display: &mut epd_waveshare::epd7in5_v2::Display7in5){
     let (tt, now) = match fetch_data(){
         Ok(d) => d,
@@ -289,6 +318,21 @@ fn update_display_buffer(display: &mut epd_waveshare::epd7in5_v2::Display7in5){
 }
 
 
+fn display_custom_message(display: &mut epd_waveshare::epd7in5_v2::Display7in5, msg: &str){
+    display.clear(Color::Black).unwrap();
+    let text_style = U8g2TextStyle::new(u8g2_fonts::fonts::u8g2_font_profont22_mr, Color::White);
+
+    let display_area = display.bounding_box();
+    let text = Text::new(msg, Point::zero(), &text_style);
+
+    LinearLayout::vertical(Chain::new(text))
+        .with_alignment(horizontal::Center)
+        .arrange()
+        .align_to(&display_area, horizontal::Center, vertical::Center)
+        .draw(display)
+        .unwrap();
+}
+
 fn get_full_subject_name(shortname: &str) -> Option<&'static str>{
     if shortname.len() < 2{
         return None;