feat: change cts callback to get unix time

Author: electricalgorithm

src/bluetooth/services/current_time_service.c

@@ -1,27 +1,14 @@
 #include <zephyr/sys/byteorder.h>
 #include <zephyr/logging/log.h>
 #include <zephyr/bluetooth/gatt.h>
+#include <string.h>
 
-#include "current_time_service.h"
+#include "timeutils/timeutils.h"
+#include "devicetwin/devicetwin.h"
 
 LOG_MODULE_REGISTER(ZephyrWatch_CurrentTimeService, LOG_LEVEL_INF);
 
-
-/* Holds current time data. */
-static uint8_t m_current_time_data[10] = {
-	232U,	// Year (2024) last byte
-	7U,		// Year (2024) first byte
-	5U,		// Month (May)
-	13U,	// Day (13th)
-	23U,	// Hours (23)
-	45U,	// Minutes (45)
-	30U,	// Seconds (30)
-	2U,		// Day of week (Tuesday)
-	0U,		// Fractions 256 part of 'Exact Time 256'
-	0U,		// Adjust reason
-};
-
-/* Current Time Service Declaration */
+/* Current Time Service Write Callback */
 static ssize_t m_time_write_callback(
 	struct bt_conn *conn,
 	const struct bt_gatt_attr *attr,
@@ -30,56 +17,45 @@ static ssize_t m_time_write_callback(
 	uint16_t offset,
 	uint8_t flags) {
 
-	// Get the value of the attribute.
-	uint8_t *value = attr->user_data;
-
-	// Check if the value written is valid.
-	if (offset + len > sizeof(m_current_time_data)) {
-		LOG_ERR("Write request too long.");
+	// Check if we received exactly 4 bytes for UNIX timestamp
+	if (len != 4 || offset != 0) {
+		LOG_ERR("Invalid write length or offset. Expected 4 bytes at offset 0, got %d bytes at offset %d", len, offset);
 		return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
 	}
 
-	// Copy the new value into the m_current_time_data array (given as buffer).
-	memcpy(value + offset, buf, len);
-	LOG_INF("Current time updated from the Bluetooth client.");
+	// Extract the UNIX timestamp from the buffer (assuming little-endian)
+	uint32_t unix_timestamp = sys_le32_to_cpu(*(uint32_t *)buf);
+	LOG_INF("Received UNIX timestamp: %u", unix_timestamp);
+
+	// Convert UNIX timestamp to UTC time
+	utc_time_t utc_time = unix_to_utc(unix_timestamp);
+	
+	// Get the device twin instance
+	device_twin_t *device_twin = get_device_twin_instance();
+	if (device_twin == NULL) {
+		LOG_ERR("Failed to get device twin instance.");
+		return BT_GATT_ERR(BT_ATT_ERR_UNLIKELY);
+	}
+
+	// Update the device twin's current time
+	device_twin->current_time = utc_time;
+	
+	LOG_INF("Current time updated: %04d-%02d-%02d %02d:%02d:%02d", 
+		utc_time.year, utc_time.month, utc_time.day,
+		utc_time.hour, utc_time.minute, utc_time.second);
+
 	return len;
 }
 
+/* Dummy data for GATT characteristic - not used for actual data storage */
+static uint8_t dummy_data[4] = {0};
+
 /* Current Time Service Declaration */
-/*
 BT_GATT_SERVICE_DEFINE(cts_cvs,
 	BT_GATT_PRIMARY_SERVICE(BT_UUID_CTS),
 	BT_GATT_CHARACTERISTIC(
 		BT_UUID_CTS_CURRENT_TIME,
 		BT_GATT_CHRC_WRITE,
 		BT_GATT_PERM_WRITE,
-		NULL, m_time_write_callback, m_current_time_data),
+		NULL, m_time_write_callback, dummy_data),
 );
-*/
-
-/* API for the Current Time Service application layer consumers.
- * - get_current_time: Get the current time. Returns a struct with
- * proper key-value pairs for year, month, hours, minutes, and seconds.
- * - set_current_time: Set the current time. Takes a struct with
- * proper key-value pairs for year, month, hours, minutes, and seconds.
- */
-
-struct current_time get_current_time(void) {
-	struct current_time time;
-	time.year = sys_le16_to_cpu(*(uint16_t *) &m_current_time_data[0]);
-	time.month = m_current_time_data[2];
-	time.day = m_current_time_data[3];
-	time.hours = m_current_time_data[4];
-	time.minutes = m_current_time_data[5];
-	time.seconds = m_current_time_data[6];
-	return time;
-}
-
-void set_current_time(struct current_time time) {
-	*(uint16_t *) &m_current_time_data[0] = sys_cpu_to_le16(time.year);
-	m_current_time_data[2] = time.month;
-	m_current_time_data[3] = time.day;
-	m_current_time_data[4] = time.hours;
-	m_current_time_data[5] = time.minutes;
-	m_current_time_data[6] = time.seconds;
-}