samples: cellular: nrf_cloud_multi_service: Button press alert

Extend the multi service sample by adding button handling.

When the button is pressed, send an alert to the cloud.

Signed-off-by: Pete Skeggs <peter.skeggs@nordicsemi.no>

samples/cellular/nrf_cloud_multi_service/prj.conf

@@ -14,6 +14,7 @@ CONFIG_EVENTS=y
 CONFIG_PICOLIBC_IO_FLOAT=y
 CONFIG_RESET_ON_FATAL_ERROR=y
 CONFIG_NCS_SAMPLES_DEFAULTS=y
+CONFIG_DK_LIBRARY=y
 
 # LED indication
 # Uncomment these to minimize LED state indication when power savings are necessary

samples/cellular/nrf_cloud_multi_service/src/application.c

@@ -20,6 +20,7 @@
 #include <modem/location.h>
 #include "location_tracking.h"
 #endif
+#include <dk_buttons_and_leds.h>
 #include "application.h"
 #include "temperature.h"
 #include "cloud_connection.h"
@@ -322,6 +323,16 @@ static void test_counter_send(void)
 	}
 }
 
+static void button_handler(uint32_t button_state, uint32_t has_changed)
+{
+	if (has_changed & DK_BTN1_MSK) {
+		if ((button_state & DK_BTN1_MSK) == DK_BTN1_MSK) {
+			LOG_INF("Button pressed");
+			(void)nrf_cloud_alert_send(ALERT_TYPE_MSG, 0, "Button pressed");
+		}
+	}
+}
+
 static void print_reset_reason(void)
 {
 	uint32_t reset_reason;
@@ -352,6 +363,8 @@ void main_application_thread_fn(void)
 		register_general_dev_msg_handler(handle_at_cmd_requests);
 	}
 
+	dk_buttons_init(button_handler);
+
 	/* Wait for first connection before starting the application. */
 	(void)await_cloud_ready(K_FOREVER);