mqtt_mux: add publish example

src/main.rs

@@ -96,10 +96,10 @@ fn main() -> ! {
 		.pll1_r_ck(400.mhz())
 		.freeze(vos, &dp.SYSCFG);
 
-	unsafe {
-		logger::enable_itm(&dp.DBGMCU, &mut cp.DCB, &mut cp.ITM);
-	}
-	logger::init();
+	// unsafe {
+	// 	logger::enable_itm(&dp.DBGMCU, &mut cp.DCB, &mut cp.ITM);
+	// }
+	// logger::init();
 	
 	let mut delay = cp.SYST.delay(ccdr.clocks);
 
@@ -111,9 +111,11 @@ fn main() -> ! {
 	let gpiof = dp.GPIOF.split(ccdr.peripheral.GPIOF);
     let gpiog = dp.GPIOG.split(ccdr.peripheral.GPIOG);
     
-	trace!("Flashing configuration bitstream to iCE40 HX8K on Humpback.");
-	delay.delay_ms(1000_u16);
+    gpiob.pb3.into_alternate_af0().set_speed(Speed::VeryHigh);
 
+	// trace!("Flashing configuration bitstream to iCE40 HX8K on Humpback.");
+	// delay.delay_ms(1000_u16);
+/*
 	// Using SPI_1 alternate functions (af5)
 	let fpga_sck = gpiob.pb3.into_alternate_af5();
 	let fpga_sdo = gpiob.pb4.into_alternate_af5();
@@ -136,7 +138,7 @@ fn main() -> ! {
 	);
 
 	flash_ice40_fpga(fpga_cfg_spi, fpga_ss, fpga_creset, fpga_cdone, delay).unwrap();
-
+*/
     // Configure ethernet IO
     {
         let _rmii_refclk = gpioa.pa1.into_alternate_af11().set_speed(Speed::VeryHigh);
@@ -217,6 +219,11 @@ fn main() -> ! {
         parts.spi1, parts.spi2, parts.spi3, parts.spi4, parts.spi5, parts.spi6, parts.spi7
     );
     
+	unsafe {
+		logger::enable_itm(&dp.DBGMCU, &mut cp.DCB, &mut cp.ITM);
+	}
+	logger::init();
+
 	urukul.reset().unwrap();
 	info!("Test value: {}", urukul.test().unwrap());
 
@@ -275,11 +282,16 @@ fn main() -> ! {
         if connection && !has_subscribed && tick {
             match client.subscribe("Urukul/Control/#", &[]) {
                 Ok(()) => has_subscribed = true,
-                Err(minimq::Error::NotReady) => {},
+                Err(minimq::Error::NotReady) => warn!("Minimq is not ready"),
                 e => warn!("{:?}", e),
             };
         }
 
+        if connection && tick && (time % 3000) == 0 {
+            info!("Feedback from print publish: {:?}", client
+                .publish("Channel1/Switch", mqtt_mux.get_switch_status_message(1).unwrap().as_bytes(), QoS::AtMostOnce, &[]));
+        }
+
         // Reset tick flag
         tick = false;
     }

src/mqtt_mux.rs

@@ -278,6 +278,15 @@ impl<SPI, E> MqttMux<SPI> where SPI: Transfer<u8, Error = E> {
             MqttCommand::Profile(prof) => self.urukul.set_profile(prof),
         }
     }
+
+    pub fn get_switch_status_message(&mut self, channel: u8) -> Result<&str, Error<E>> {
+        self.urukul.get_channel_switch_status(channel.into()).map(
+            |stat| if stat {
+                "on"
+            } else {
+                "off"
+            })
+    }
 }
 
 // Read message parameter separator (optional comma and whitespace)