Tasmota: Add optional retain flag to Publish command

[yoh-there]

This is related to #2851

If a rule is used to determine a state (in said example the dimmer state), it would be nice if optionally a retained MQTT message instead of a normal message could be published. This would avoid using an automation hub solely for that purpose. As I don't think a second parameter is feasible in the tasmota command architecture, maybe an approach is to implement a PUBLISHRETAIN command.

Thank you for considering.

[ascillato]

Hi,

On the file _user_config.h_ you can set at line 89:

#define MQTT_BUTTON_RETAIN     0                 // [ButtonRetain] Button may send retain flag (0 = off, 1 = on)
#define MQTT_POWER_RETAIN      0                 // [PowerRetain] Power status message may send retain flag (0 = off, 1 = on)
#define MQTT_SWITCH_RETAIN     0                 // [SwitchRetain] Switch may send retain flag (0 = off, 1 = on)
#define MQTT_TELE_RETAIN       0                   // Tele messages may send retain flag (0 = off, 1 = on)

And also you can set by commands on the console:

PowerRetain 1
ButtonRetain 1
SwitchRetain 1

[yoh-there]

I know, and it can even be set with Options (ie for POWER), but that is not what I meant. I meant when using the Publish command in a rule. I would rather not use privately compiled versions anyway, but that is an other matter.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[jsmath]

I also would like to see the ability to publish retained messages when using rules.

[ascillato]

@yoh-there

PR #3593 with command PUBLISH2 for sending retained MQTT messages

[yoh-there]

Thank you, great job

[ascillato]

Sorry for the delay. Thanks for the patience :+1: