mosquitto/test/broker/04-retain-upgrade-outgoing-qos.py

#!/usr/bin/env python3

# Test whether a retained PUBLISH to a topic with QoS 0 is sent with subscriber QoS
# when upgrade_outgoing_qos is true

from mosq_test_helper import *

def write_config(filename, port):
    with open(filename, 'w') as f:
        f.write("port %d\n" % (port))
        f.write("upgrade_outgoing_qos true\n")

port = mosq_test.get_port()
conf_file = os.path.basename(__file__).replace('.py', '.conf')
write_config(conf_file, port)

rc = 1
keepalive = 60
mid = 16
connect_packet = mosq_test.gen_connect("retain-qos0-test", keepalive=keepalive)
connack_packet = mosq_test.gen_connack(rc=0)

publish_packet = mosq_test.gen_publish("retain/qos0/test", qos=0, payload="retained message", retain=True)
subscribe_packet = mosq_test.gen_subscribe(mid, "retain/qos0/test", 1)
suback_packet = mosq_test.gen_suback(mid, 1)

publish_packet2 = mosq_test.gen_publish("retain/qos0/test", mid=1, qos=1, payload="retained message", retain=True)

broker = mosq_test.start_broker(filename=os.path.basename(__file__), use_conf=True, port=port)

try:
    sock = mosq_test.do_client_connect(connect_packet, connack_packet, port=port)
    sock.send(publish_packet)

    mosq_test.do_send_receive(sock, subscribe_packet, suback_packet, "suback")

    if mosq_test.expect_packet(sock, "publish", publish_packet2):
        rc = 0

    sock.close()
finally:
    os.remove(conf_file)
    broker.terminate()
    broker.wait()
    (stdo, stde) = broker.communicate()
    if rc:
        print(stde.decode('utf-8'))

exit(rc)