Connecting to component 1 via Pymavlink

Hi,I’m trying to get mavlink messages from component 1.
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from pymavlink import mavutil

the_connection = mavutil.mavlink_connection('/dev/ttyS0', 921600,source_component=1)

the_connection.wait_heartbeat()
print("Heartbeat from system (system %u component %u)" %(the_connection.target_system, the_connection.target_component))

while True:
    response = the_connection.recv_match(blocking=True)
    print(response)

But the response only has heartbeat from component 0