Read the model number for diagnostics purposes

The model number isn't strictly needed anymore, because libdivecomputer
uses the information in the version packet to the detect the dive
computer model. However, since the internal lookup table is still based
on the model number, having easy access to the model number in the debug
logs is very convenient when adding support for new devices.

Author: jefdriesen

src/mares_iconhd.c

@@ -91,6 +91,7 @@
 #define CMD_OBJ_ODD   0xFE
 
 #define OBJ_DEVICE        0x2000
+#define OBJ_DEVICE_MODEL  0x02
 #define OBJ_DEVICE_SERIAL 0x04
 #define OBJ_LOGBOOK       0x2008
 #define OBJ_LOGBOOK_COUNT 0x01
@@ -1033,6 +1034,26 @@ mares_iconhd_device_foreach_object (dc_device_t *abstract, dc_dive_callback_t ca
 		return DC_STATUS_NOMEMORY;
 	}
 
+	// Read the model number.
+	rc = mares_iconhd_read_object (device, NULL, buffer, OBJ_DEVICE, OBJ_DEVICE_MODEL);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR (abstract->context, "Failed to read the model number.");
+		dc_buffer_free (buffer);
+		return rc;
+	}
+
+	if (dc_buffer_get_size (buffer) < 4) {
+		ERROR (abstract->context, "Unexpected number of bytes received (" DC_PRINTF_SIZE ").",
+			dc_buffer_get_size (buffer));
+		dc_buffer_free (buffer);
+		return DC_STATUS_PROTOCOL;
+	}
+
+	unsigned int DC_ATTR_UNUSED model = array_uint32_le (dc_buffer_get_data (buffer));
+
+	// Erase the buffer.
+	dc_buffer_clear (buffer);
+
 	// Read the serial number.
 	rc = mares_iconhd_read_object (device, NULL, buffer, OBJ_DEVICE, OBJ_DEVICE_SERIAL);
 	if (rc != DC_STATUS_SUCCESS) {