9.10.2.2 +MQTTCONNACK

Connection acknowledge.

Table 9-91. AEC Syntax
AEC	Description
`+MQTTCONNACK:<CONNACK_FLAGS>,<RETURN_CODE>`	Connection state

Table 9-92. AEC Element Syntax
Element Name	Type	Description
`<CONNACK_FLAGS>`	Integer	Connect acknowledge flags
`<RETURN_CODE>`	Integer	Connect return code `0` – Success `128` – Unspecified error `129` – Malformed packet `130` – Protocol error `131` – Implementation specific error `132` – Unsupported protocol version `133` – Client identifier not valid `134` – Bad username or password `135` – Not authorized `136` – Server unavailable `137` – Server busy `138` – Banned `140` – Bad authentication method `144` – Topic name invalid `149` – Packet too large `151` – Quota exceeded `153` – Payload format invalid `154` – Retain not supported `155` – QoS not supported `156` – Use another server `156` – Server moved `159` – Connection rate exceeded