Generic MQTT-SN definitions.  
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| enum   | {  
  MQTTSN_DUP = 0x80
, MQTTSN_QOS_MASK = 0x60
, MQTTSN_QOS_2 = 0x40
, MQTTSN_QOS_1 = 0x20
,  
  MQTTSN_QOS_NEG1 = 0x60
, MQTTSN_QOS_0 = 0x00
, MQTTSN_RETAIN = 0x10
, MQTTSN_WILL = 0x08
,  
  MQTTSN_CS = 0x04
, MQTTSN_TIT_MASK = 0x03
, MQTTSN_TIT_SHORT = 0x02
, MQTTSN_TIT_PREDEF = 0x01
,  
  MQTTSN_TIT_NORMAL = 0x00
 
 } | 
|   | MQTT-SN flags.  More...
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|   | 
| enum   | {  
  MQTTSN_ADVERTISE = 0x00
, MQTTSN_SEARCHGW = 0x01
, MQTTSN_GWINFO = 0x02
, MQTTSN_CONNECT = 0x04
,  
  MQTTSN_CONNACK = 0x05
, MQTTSN_WILLTOPICREQ = 0x06
, MQTTSN_WILLTOPIC = 0x07
, MQTTSN_WILLMSGREQ = 0x08
,  
  MQTTSN_WILLMSG = 0x09
, MQTTSN_REGISTER = 0x0a
, MQTTSN_REGACK = 0x0b
, MQTTSN_PUBLISH = 0x0c
,  
  MQTTSN_PUBACK = 0x0d
, MQTTSN_PUBCOMP = 0x0e
, MQTTSN_PUBREC = 0x0f
, MQTTSN_PUBREL = 0x10
,  
  MQTTSN_SUBSCRIBE = 0x12
, MQTTSN_SUBACK = 0x13
, MQTTSN_UNSUBSCRIBE = 0x14
, MQTTSN_UNSUBACK = 0x15
,  
  MQTTSN_PINGREQ = 0x16
, MQTTSN_PINGRESP = 0x17
, MQTTSN_DISCONNECT = 0x18
, MQTTSN_WILLTOPICUPD = 0x1a
,  
  MQTTSN_WILLTOPICRESP = 0x1b
, MQTTSN_WILLMSGUPD = 0x1c
, MQTTSN_WILLMSGRESP = 0x1d
 
 } | 
|   | MQTT-SN message types.  More...
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| enum   | { MQTTSN_ACCEPTED = 0x00
, MQTTSN_REJ_CONGESTION = 0x01
, MQTTSN_REJ_INV_TOPIC_ID = 0x02
, MQTTSN_REJ_NOTSUP = 0x03
 } | 
|   | MQTT-SN return codes.  More...
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