Add live log buffering support and endpoint; enhance log display functionality.

Software/MainBoard/rust/src/hal/water.rs

@@ -88,15 +88,33 @@ impl<'a> TankSensor<'a> {
         //multisample should be moved to water_temperature_c
         let mut attempt = 1;
         let mut delay = Delay::new();
-        self.one_wire_bus.reset(&mut delay)?;
+
+        let presence = self.one_wire_bus.reset(&mut delay)?;
+        println!("OneWire: reset presence pulse = {}", presence);
+        if !presence {
+            println!("OneWire: no device responded to reset — check pull-up resistor and wiring");
+        }
+
         let mut search = DeviceSearch::new();
         let mut water_temp_sensor: Option<Device> = None;
+        let mut devices_found = 0u8;
         while let Some(device) = self.one_wire_bus.search_next(&mut search, &mut delay)? {
+            devices_found += 1;
+            println!(
+                "OneWire: found device #{} family=0x{:02X} addr={:02X?}",
+                devices_found, device.address[0], device.address
+            );
             if device.address[0] == ds18b20::FAMILY_CODE {
                 water_temp_sensor = Some(device);
                 break;
+            } else {
+                println!("OneWire: skipping device — not a DS18B20 (family 0x{:02X} != 0x{:02X})", device.address[0], ds18b20::FAMILY_CODE);
             }
         }
+        if devices_found == 0 {
+            println!("OneWire: search found zero devices on the bus");
+        }
+
         match water_temp_sensor {
             Some(device) => {
                 println!("Found one wire device: {:?}", device);