diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 967207bb..4fdaf4ba 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -98,6 +98,7 @@ jobs:
           - path: stm32/stm32-nucleo-f429z
           - path: stm32/stm32-nucleo-h743z
           - path: stm32/nucleo-f429zi-baremetal
+            target: test
           - path: stm32/nucleo-f429zi-freertos-mip
           - path: stm32/nucleo-f429zi-usb-rndis
           - path: stm32/nucleo-f746zg-baremetal
@@ -135,7 +136,7 @@ jobs:
       - uses: actions/checkout@v3
       - run: sudo apt -y install gcc-arm-none-eabi
       - name: ${{ matrix.example.path }}
-        run: make -C examples/${{ matrix.example.path }} build
+        run: make -C examples/${{ matrix.example.path }} ${{ matrix.example.target || 'build' }} VCON_API_KEY=${{secrets.VCON_API_KEY}}
   zephyr_examples:
     runs-on: ubuntu-latest
     steps:
diff --git a/examples/device-dashboard/net.c b/examples/device-dashboard/net.c
index 21782a76..61f1be75 100644
--- a/examples/device-dashboard/net.c
+++ b/examples/device-dashboard/net.c
@@ -109,6 +109,7 @@ static void mqtt_fn(struct mg_connection *c, int ev, void *ev_data, void *fnd) {
     c->is_hexdumping = 1;
     mg_mqtt_sub(s_mqtt, mg_str(s_config.sub), 2);
     send_notification(c->mgr, "{%Q:%Q,%Q:null}", "name", "config", "data");
+    MG_INFO(("MQTT connected, server %s", MQTT_SERVER));
   } else if (ev == MG_EV_MQTT_MSG) {
     struct mg_mqtt_message *mm = ev_data;
     send_notification(c->mgr, "{%Q:%Q,%Q:{%Q: %.*Q, %Q: %.*Q, %Q: %d}}", "name",
diff --git a/examples/stm32/nucleo-f429zi-baremetal/Makefile b/examples/stm32/nucleo-f429zi-baremetal/Makefile
index 25baa026..98e3787b 100644
--- a/examples/stm32/nucleo-f429zi-baremetal/Makefile
+++ b/examples/stm32/nucleo-f429zi-baremetal/Makefile
@@ -1,42 +1,35 @@
-TARGET  = firmware
-ROOT    ?= $(realpath $(CURDIR)/../../..)
-D ?= docker
-DOCKER 	?= $(D) run --rm -v $(ROOT):$(ROOT) -w $(CURDIR) mdashnet/armgcc
-CROSS   ?= arm-none-eabi
 CFLAGS  ?=  -W -Wall -Wextra -Werror -Wundef -Wshadow -Wdouble-promotion \
 						-Wformat-truncation -fno-common -Wconversion \
-						-g3 -Os -ffunction-sections -fdata-sections -I. -I$(ROOT) \
-            -DMG_ARCH=MG_ARCH_NEWLIB -DMIP_DEBUG=1 -DMG_ENABLE_PACKED_FS=1 \
-						-DMG_ENABLE_CUSTOM_MILLIS=1 -DxMG_ENABLE_LINES=1 -DMG_ENABLE_MIP=1 \
+						-g3 -Os -ffunction-sections -fdata-sections -I. \
 						-mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 $(EXTRA_CFLAGS)
 LDFLAGS ?= -Tlink.ld -nostartfiles -nostdlib --specs nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
-SOURCES = boot.c main.c syscalls.c \
-          $(ROOT)/mongoose.c \
-          $(ROOT)/examples/device-dashboard/packed_fs.c \
-          $(ROOT)/examples/device-dashboard/net.c
+SOURCES = boot.c main.c syscalls.c
 
-all build example: $(TARGET).bin
+# Add Mongoose-specific flags and source files
+CFLAGS  += -I../../.. -DMG_ARCH=MG_ARCH_NEWLIB -DMG_ENABLE_CUSTOM_MILLIS=1 -DMG_ENABLE_MIP=1 -DMG_ENABLE_PACKED_FS=1
+SOURCES += ../../../mongoose.c ../../device-dashboard/net.c ../../device-dashboard/packed_fs.c
 
-$(TARGET).bin: $(TARGET).elf
-	$(DOCKER) $(CROSS)-objcopy -O binary $< $@
+all build example: firmware.bin
 
-$(TARGET).elf: $(SOURCES) mcu.h
-	$(DOCKER) $(CROSS)-gcc $(SOURCES) $(CFLAGS) $(LDFLAGS) -o $@
+firmware.bin: firmware.elf
+	arm-none-eabi-objcopy -O binary $< $@
 
-# Build on Windows. Download Win32 Zip from ARM GCC downloads, unzip to c:\armgcc
-ARMGCC ?= c:/armgcc
-windows: $(TARGET).bin
-windows: CROSS = $(ARMGCC)/bin/arm-none-eabi
-windows: DOCKER =
-
-# Show top 10 stack-hungry functions
-su: CFLAGS += -fstack-usage
-su: $(TARGET).elf
-	cat *.su | sort -rnk2 | head -10
+firmware.elf: $(SOURCES) mcu.h
+	arm-none-eabi-gcc $(SOURCES) $(CFLAGS) $(LDFLAGS) -o $@
 
 # Note: on "unknown chip id" flash error, wire BOOT0 to VDD and st-flash erase
-flash: $(TARGET).bin
-	st-flash --reset write $(TARGET).bin 0x8000000
+flash: firmware.bin
+	st-flash --reset write $< 0x8000000
+
+# Requires env variable VCON_API_KEY set
+DEVICE_URL ?= https://dash.vcon.io/api/v3/devices/2
+test: update
+	curl --fail -su :$(VCON_API_KEY) $(DEVICE_URL)/tx?t=5 | tee /tmp/output.txt
+	grep 'Ethernet: up' /tmp/output.txt
+	grep 'MQTT connected' /tmp/output.txt
+
+update: firmware.bin
+	curl --fail -su :$(VCON_API_KEY) $(DEVICE_URL)/ota --data-binary @$<
 
 clean:
-	@rm -rf $(TARGET).* *.su
+	@rm -rf firmware.* *.su
diff --git a/examples/stm32/nucleo-f429zi-baremetal/main.c b/examples/stm32/nucleo-f429zi-baremetal/main.c
index d8553c6f..4ceb4f8e 100644
--- a/examples/stm32/nucleo-f429zi-baremetal/main.c
+++ b/examples/stm32/nucleo-f429zi-baremetal/main.c
@@ -4,19 +4,14 @@
 #include "mcu.h"
 #include "mongoose.h"
 
-#define LED1 PIN('B', 0)   // On-board LED pin (green)
-#define LED2 PIN('B', 7)   // On-board LED pin (blue)
-#define LED3 PIN('B', 14)  // On-board LED pin (red)
-#define BTN1 PIN('C', 13)  // On-board user button
+#define LED1 PIN('B', 0)      // On-board LED pin (green)
+#define LED2 PIN('B', 7)      // On-board LED pin (blue)
+#define LED3 PIN('B', 14)     // On-board LED pin (red)
+#define BTN1 PIN('C', 13)     // On-board user button
+#define BLINK_PERIOD_MS 1000  // LED blinking period in millis
 
 static uint64_t s_ticks, s_exti;  // Counters, increased by IRQ handlers
 
-static void blink_cb(void *arg) {  // Blink periodically
-  // MG_INFO(("ticks: %u", (unsigned) s_ticks));
-  gpio_toggle(LED2);
-  (void) arg;
-}
-
 uint64_t mg_millis(void) {  // Declare our own uptime function
   return s_ticks;           // Return number of milliseconds since boot
 }
@@ -36,15 +31,22 @@ void EXTI15_10_IRQHandler(void) {  // External interrupt handler
   gpio_write(LED1, gpio_read(BTN1));  // No debounce. Turn LED if button pressed
 }
 
+static void timer_cb(void *arg) {
+  gpio_toggle(LED2);  // Blink LED
+  bool up = ((struct mip_if *) arg)->state == MIP_STATE_READY;
+  MG_INFO(("Ethernet: %s", up ? "up" : "down"));  // Show network status
+}
+
 int main(void) {
-  static struct uart *uart = UART3;  // Use UART3 - its attached to debug
-  clock_init();                      // Set clock to 180MHz
-  systick_init(FREQ / 1000);         // Increment s_ticks every ms
-  gpio_output(LED1);                 // Setup green LED
-  gpio_output(LED2);                 // Setup blue LED
-  gpio_input(BTN1);                  // Set button to input
-  irq_exti_attach(BTN1);             // Attach BTN1 to exti
-  uart_init(uart, 115200);           // It is wired to the debug port
+  clock_init();                        // Set clock to 180MHz
+  systick_init(SYS_FREQUENCY / 1000);  // Increment s_ticks every ms
+  gpio_output(LED1);                   // Setup green LED
+  gpio_output(LED2);                   // Setup blue LED
+  gpio_input(BTN1);                    // Set button to input
+  irq_exti_attach(BTN1);               // Attach BTN1 to exti
+  uart_init(UART1, 115200);            // Initialise debug printf
+
+  MG_INFO(("Starting, CPU freq %g MHz", (double) SYS_FREQUENCY / 1000000));
 
   // Initialise Ethernet. Enable MAC GPIO pins, see
   // https://www.farnell.com/datasheets/2014265.pdf section 6.10
@@ -65,23 +67,30 @@ int main(void) {
   struct mg_mgr mgr;        // Initialise Mongoose event manager
   mg_mgr_init(&mgr);        // and attach it to the MIP interface
   mg_log_set(MG_LL_DEBUG);  // Set log level
-  mg_timer_add(&mgr, 500, MG_TIMER_REPEAT, blink_cb, &mgr);
 
   // Initialise Mongoose network stack
   // Specify MAC address, and IP/mask/GW in network byte order for static
   // IP configuration. If IP/mask/GW are unset, DHCP is going to be used
-  struct mip_driver_stm32_data driver_data = {.mdc_cr = 4};  // See driver_stm32.h
-  struct mip_if mif = {
-      .mac = {2, 0, 1, 2, 3, 5},
-      .driver = &mip_driver_stm32,
-      .driver_data = &driver_data,
-  };
+  struct mip_driver_stm32_data driver_data = {.mdc_cr = 4};  // driver_stm32.h
+  struct mip_if mif = {.mac = {2, 0, 1, 2, 3, 5},
+                       .driver = &mip_driver_stm32,
+                       .driver_data = &driver_data};
   mip_init(&mgr, &mif);
+  mg_timer_add(&mgr, BLINK_PERIOD_MS, MG_TIMER_REPEAT, timer_cb, &mif);
 
-  MG_INFO(("Init done, starting main loop"));
+  MG_INFO(("Waiting until network is up..."));
+  while (mif.state != MIP_STATE_READY) {
+    mg_mgr_poll(&mgr, 0);
+  }
+
+  MG_INFO(("Initialising application..."));
   extern void device_dashboard_fn(struct mg_connection *, int, void *, void *);
   mg_http_listen(&mgr, "http://0.0.0.0", device_dashboard_fn, &mgr);
-  for (;;) mg_mgr_poll(&mgr, 0);  // Infinite event loop
+
+  MG_INFO(("Starting event loop"));
+  for (;;) {
+    mg_mgr_poll(&mgr, 0);
+  }
 
   return 0;
 }
diff --git a/examples/stm32/nucleo-f429zi-baremetal/mcu.h b/examples/stm32/nucleo-f429zi-baremetal/mcu.h
index 213feafa..8cda5c45 100644
--- a/examples/stm32/nucleo-f429zi-baremetal/mcu.h
+++ b/examples/stm32/nucleo-f429zi-baremetal/mcu.h
@@ -20,10 +20,10 @@
 // 33.4: The AHB clock must be at least 25 MHz when Ethernet is used
 enum { APB1_PRE = 5 /* AHB clock / 4 */, APB2_PRE = 4 /* AHB clock / 2 */ };
 enum { PLL_HSI = 16, PLL_M = 8, PLL_N = 180, PLL_P = 2 };  // Run at 180 Mhz
-//#define PLL_FREQ PLL_HSI
-#define PLL_FREQ (PLL_HSI * PLL_N / PLL_M / PLL_P)
 #define FLASH_LATENCY 5
-#define FREQ (PLL_FREQ * 1000000)
+#define SYS_FREQUENCY ((PLL_HSI * PLL_N / PLL_M / PLL_P) * 1000000)
+#define APB2_FREQUENCY (SYS_FREQUENCY / (BIT(APB2_PRE - 3)))
+#define APB1_FREQUENCY (SYS_FREQUENCY / (BIT(APB1_PRE - 3)))
 
 static inline void spin(volatile uint32_t count) {
   while (count--) asm("nop");
@@ -93,13 +93,11 @@ struct gpio {
 };
 #define GPIO(N) ((struct gpio *) (0x40020000 + 0x400 * (N)))
 
-static struct gpio *gpio_bank(uint16_t pin) {
-  return GPIO(PINBANK(pin));
-}
+static struct gpio *gpio_bank(uint16_t pin) { return GPIO(PINBANK(pin)); }
 static inline void gpio_toggle(uint16_t pin) {
   struct gpio *gpio = gpio_bank(pin);
   uint32_t mask = BIT(PINNO(pin));
-  gpio->BSRR |= mask << (gpio->ODR & mask ? 16 : 0);
+  gpio->BSRR = mask << (gpio->ODR & mask ? 16 : 0);
 }
 static inline int gpio_read(uint16_t pin) {
   return gpio_bank(pin)->IDR & BIT(PINNO(pin)) ? 1 : 0;
@@ -163,10 +161,11 @@ static inline void uart_init(struct uart *uart, unsigned long baud) {
   // https://www.st.com/resource/en/datasheet/stm32f429zi.pdf
   uint8_t af = 7;           // Alternate function
   uint16_t rx = 0, tx = 0;  // pins
+  uint32_t freq = 0;        // Bus frequency. UART1 is on APB2, rest on APB1
 
-  if (uart == UART1) RCC->APB2ENR |= BIT(4);
-  if (uart == UART2) RCC->APB1ENR |= BIT(17);
-  if (uart == UART3) RCC->APB1ENR |= BIT(18);
+  if (uart == UART1) freq = APB2_FREQUENCY, RCC->APB2ENR |= BIT(4);
+  if (uart == UART2) freq = APB1_FREQUENCY, RCC->APB1ENR |= BIT(17);
+  if (uart == UART3) freq = APB1_FREQUENCY, RCC->APB1ENR |= BIT(18);
 
   if (uart == UART1) tx = PIN('A', 9), rx = PIN('A', 10);
   if (uart == UART2) tx = PIN('A', 2), rx = PIN('A', 3);
@@ -174,9 +173,8 @@ static inline void uart_init(struct uart *uart, unsigned long baud) {
 
   gpio_init(tx, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, 0, af);
   gpio_init(rx, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, 0, af);
-  uart->CR1 = 0;                    // Disable this UART
-  uart->BRR = FREQ / 4 / baud;      // Baud rate, "4" is APBx prescaler, different from APBx_PRE
-                                    // TODO(): make this configurable ?
+  uart->CR1 = 0;                           // Disable this UART
+  uart->BRR = freq / baud;                 // Set baud rate
   uart->CR1 |= BIT(13) | BIT(2) | BIT(3);  // Set UE, RE, TE
 }
 static inline void uart_write_byte(struct uart *uart, uint8_t byte) {
diff --git a/examples/stm32/nucleo-f429zi-baremetal/syscalls.c b/examples/stm32/nucleo-f429zi-baremetal/syscalls.c
index 3b16ca78..4a16522c 100644
--- a/examples/stm32/nucleo-f429zi-baremetal/syscalls.c
+++ b/examples/stm32/nucleo-f429zi-baremetal/syscalls.c
@@ -53,7 +53,7 @@ int _getpid(void) {
 
 int _write(int fd, char *ptr, int len) {
   (void) fd, (void) ptr, (void) len;
-  if (fd == 1) uart_write_buf(UART3, ptr, (size_t) len);
+  if (fd == 1) uart_write_buf(UART1, ptr, (size_t) len);
   return -1;
 }