MAV_FRAME_LOCAL_FRD not working

[pd3a]

I have tried sending velocity (forward, right, down) using send_ned_vel(v_x,v_y,v_z) and frame of MAV_FRAME_LOCAL_FRD but the vehicle is not changing vehicle.attitude.yaw. Please help how i can change my vehicle heading using velocity inputs. I have tried in both LOCAL_NED frame and GLOBAL_NED frame. The drone moves in the defined heading but the drone's attitude is not changing.
This is the command i used.
def send_ned_velocity(v_x,v_y,v_z):
msg = vehicle.message_factory.set_position_target_local_ned_encode(
0, # time_boot_ms (not used)
0, 0, # target system, target component
mavutil.mavlink.MAV_FRAME_LOCAL_FRD, # frame
0b0000111111000111, # type_mask (only speeds enabled)
0, 0, 0, # x, y, z positions (not used)
v_x, v_y, v_z, # x, y, z velocity in m/s
0, 0, 0, # x, y, z acceleration (not supported yet, ignored in GCS_Mavlink)
0, 0) # yaw, yaw_rate (not supported yet, ignored in GCS_Mavlink)
vehicle.send_mavlink(msg)