APUE Learning Example Source Code
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guowenxue
2019-06-26 157be0b0d4c7d4809cfcafc76235cc18388378c8 
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MQTT_SUB_OPT_NO_LOCAL = 0x04


MQTT_SUB_OPT_RETAIN_AS_PUBLISHED = 0x08


MQTT_SUB_OPT_SEND_RETAIN_ALWAYS = 0x00


MQTT_SUB_OPT_SEND_RETAIN_NEW = 0x10


MQTT_SUB_OPT_SEND_RETAIN_NEVER = 0x20