mqtt-sn gate can not connect mqtt server？ about mqttsn HOT 6 CLOSED

and can you update PubsubClient to V2.8?

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I knows where is the problem， because esp8266_hc12_gateway example lost mqttc.loop();
I add it, and now run OK. but the new error is:

`[+]Got SUBSCRIBE.
[+]Topic name: led, ID: 1
[+]SUBACK sent.
[+]MQTT SUBSCRIBE to esp8266mqttsn/led.
[+]
[+]Got PUBLISH.
[+]MQTT PUBLISH to esp8266mqttsn/led

[+]Got MQTT PUBLISH to esp8266mqttsn/led.
[+]Dispatching msgs.
Fatal exception 28(LoadProhibitedCause):epc1=0x40201be6, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000--------------- CUT HERE FOR EXCEPTION DECODER ---------------
Exception (28):
epc1=0x40201be6 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

stack>>>

ctx: cont
sp: 3ffffda0 end: 3fffffc0 offset: 0190
3fffff30: 3fffdad0 3fff0631 3ffee72c 40201b71
3fffff40: 00010000 00000000 3fff0600 3fff0638
3fffff50: 3fffda01 3ffe080c 3ffee9fe 40201d81
3fffff60: 3ffefdfc 3ffefce8 3ffeea00 00000001
3fffff70: 00000000 00000000 3fff07f4 3fff0870
3fffff80: 00000000 00000000 00000001 3fff0870
3fffff90: 3fffdad0 00000000 3fff0830 40201297
3fffffa0: feefeffe 00000000 3fff0830 402065a4
3fffffb0: feefeffe feefeffe 3ffe8508 40101851
<<<stack<<<
--------------- CUT HERE FOR EXCEPTION DECODER ---------------H≈?�1?)?
SDK:2.2.2-dev(38a443e)/Core:2.7.3-3-g2843a5ac=20703003/lwIP:STABLE-2_1_2_RELEASE/glue:1.2-30-g92add50/BearSSL:5c771be
`
I will try to resolve it.
Thanks a lot, this is a awesome project.

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Now I found a bug in mqttgateway.cpp loop function,
if (clnt.is_subbed(tid))
maybe is:
if (!clnt.is_subbed(tid))

when I fix it, now run OK.

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Sorry, I have no idea how I totally missed this issue all this time. Thanks for letting me know, will look into and fix that.

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Done. You can reopen the issue if you still get the exception.

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For your question on upgrading the pubsubclient version, I really don't want to have to maintain my pubsubclient changes, especially as the upstream pubsubclient diverges (however slowly). Instead, I'll provide a different MQTT-interface example using this library, that already contains the features I need, and is a richer MQTT client anyways.

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