so140 for persistent mqtt session

[barbudor]

Description:

Related issue (if applicable): fixes #15519

SetOption140 0 : Open clean mqtt session (default)
SetOption140 1 : Open persistent mqtt session

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.3
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[DetlefR]

Hello,
unfortunately, it doesn't work. Whatever I set for MQTT_CLEAN_SESSION during build, SetOption140 has no effect. Also not after reboot or power on/off.

[barbudor]

hum,
checking...

[barbudor]

I can confirm that with SetOption140 OFF, the connection is perform with CLEAN_SESSION as before
And with SetOption140 ON, the connection is left persistent
Are you sure that you have the latest build ?

[DetlefR]

Sorry,
my mistake. Due to my poor skills with git I had two versions off Tasmota.
Now it is working as expected. so140=>0 creates one volatile queue. And so140=>1 creates a second one which is persistent.

But keep in mind. You must add the subscription manually for the persistent queue.
Thank you.

[barbudor]

But keep in mind. You must add the subscription manually for the persistent queue.

I beleve this is broker specific ?