diff --git a/Drone/mavros_mavlink.py b/Drone/mavros_mavlink.py
new file mode 100644
index 0000000..57820c1
--- /dev/null
+++ b/Drone/mavros_mavlink.py
@@ -0,0 +1,125 @@
+import rospy
+import time
+from mavros_msgs.srv import CommandLong
+from mavros_msgs.srv import ParamGet
+from mavros_msgs.msg import State
+from pymavlink.dialects.v20 import common as mavlink
+
+send_command_long = rospy.ServiceProxy('/mavros/cmd/command', CommandLong)
+get_param = rospy.ServiceProxy('/mavros/param/get', ParamGet)
+system_status = -1
+heartbeat_sub = None
+heartbeat_sub_status = None
+
+def state_callback(data):
+    global system_status
+    system_status = data.system_status
+
+def check_state_topic():
+    global system_status, heartbeat_sub, heartbeat_sub_status
+    # Check subscriber
+    if (not heartbeat_sub) or (not heartbeat_sub_status):
+        rospy.loginfo('Not subscribed to topic')
+        return False
+    # Wait for heartbeat
+    start_time = time.time()
+    while system_status == -1:
+        if time.time() - start_time > 3.:
+            rospy.loginfo("Not connected to fcu. Check connection.")
+            return False
+        rospy.sleep(0.1)
+    # print(system_status)
+    return True
+
+def reboot_fcu():
+    if check_state_topic():
+        rospy.loginfo("Send reboot message to fcu")
+        send_command_long(False, mavlink.MAV_CMD_PREFLIGHT_REBOOT_SHUTDOWN, 0, 1, 0, 0, 0, 0, 0, 0)
+        return True
+    return False
+
+def calibration_msg(sensor):
+    mavlink_message = [0,0,0,0,0,0,0]
+    index, value = {
+        'gyro': (0,1),
+        'level':(4,2)
+    }.get(sensor, (0,0))
+    mavlink_message[index]=value
+    return mavlink_message
+
+def calibrate(sensor):
+    global system_status
+    if check_state_topic():
+        # Check system_status
+        if system_status > mavlink.MAV_STATE_STANDBY:
+            rospy.loginfo("System status is incorrect for calibration")
+            return False
+        # Make calibration message
+        calibration_message = calibration_msg(sensor)
+        # Send mavlink calibration command 
+        send_command_long(False, mavlink.MAV_CMD_PREFLIGHT_CALIBRATION, 0, *calibration_message)
+        rospy.loginfo('Send {} calibration message'.format(sensor))
+        # Wait until system status to uninit (during calibration on px4)
+        while system_status != mavlink.MAV_STATE_UNINIT:
+            rospy.sleep(0.1)
+        rospy.loginfo("Start {} calibration. Please, don't move the drone!".format(sensor))
+        # Wait until the end of the calibration
+        while system_status != mavlink.MAV_STATE_STANDBY:
+            rospy.sleep(0.1)
+        rospy.loginfo("Calibration is finished!")
+        return True
+    return False
+
+def get_calibration_status():
+    gyro_status = get_param('CAL_GYRO0_ID')
+    mag_status = get_param('CAL_MAG0_ID')
+    acc_status = get_param('CAL_ACC0_ID')
+    status_text = ""
+    if gyro_status.success == False:
+        status_text += "gyro: wrong_param; "
+    elif gyro_status.value.integer == 0:
+        status_text += "gyro: uncalibrated; "
+    if mag_status.success == False:
+        status_text += "mag: wrong_param; "
+    elif mag_status.value.integer == 0:
+        status_text += "mag: uncalibrated; "
+    if acc_status.success == False:
+        status_text += "acc: wrong_param; "
+    elif acc_status.value.integer == 0:
+        status_text += "acc: uncalibrated; "    
+    if status_text == "":
+        status_text = "OK"
+    else:
+        status_text = status_text[:-2]
+    return status_text
+
+def get_sys_status():
+    global system_status
+    if check_state_topic():
+        status_text = {
+            mavlink.MAV_STATE_UNINIT: "MAV_STATE_UNINIT",
+            mavlink.MAV_STATE_BOOT: "MAV_STATE_BOOT",
+            mavlink.MAV_STATE_CALIBRATING: "MAV_STATE_CALIBRATING",
+            mavlink.MAV_STATE_STANDBY: "MAV_STATE_STANDBY",
+            mavlink.MAV_STATE_ACTIVE: "MAV_STATE_ACTIVE",
+            mavlink.MAV_STATE_CRITICAL: "MAV_STATE_CRITICAL",
+            mavlink.MAV_STATE_EMERGENCY: "MAV_STATE_EMERGENCY",
+            mavlink.MAV_STATE_POWEROFF: "MAV_STATE_POWEROFF",
+            mavlink.MAV_STATE_FLIGHT_TERMINATION: "MAV_STATE_FLIGHT_TERMINATION"
+        }.get(system_status, "NOT_CONNECTED_TO_FCU")
+        return status_text
+    return "NOT_CONNECTED_TO_FCU"
+
+def start_subscriber():
+    global heartbeat_sub, heartbeat_sub_status
+    heartbeat_sub = rospy.Subscriber('/mavros/state', State, state_callback)
+    heartbeat_sub_status = True
+    # print(not heartbeat_sub)
+    # print(not heartbeat_sub_status)
+
+def stop_subscriber():
+    global heartbeat_sub, heartbeat_sub_status
+    if heartbeat_sub:
+        heartbeat_sub.unregister()
+        heartbeat_sub_status = False
+