Unable to configure relays with opposite states

[TheFax]

PROBLEM DESCRIPTION

I'm encountering a problem configuring my Sonoff Dual R3 (ESP32 based) with Tasmota32 (version 14.4.1) to achieve inverted relay states. My goal is to control both relays with a single web button, ensuring that when one relay is ON, the other is OFF, and vice-versa.

REQUESTED INFORMATION

• Read the Contributing Guide and Policy and the Code of Conduct
• Searched the problem in issues
• Searched the problem in discussions
• Searched the problem in the docs
• Searched the problem in the chat
• Device used: Sonoff Dual R3
• Tasmota binary firmware version number used: 14.4.1
  • Pre-compiled
  • Self-compiled
• Flashing tools used: RS232
• Provide the output of command: Backlog Template; Module; GPIO 255:

00:00:31.678 RSL: RESULT = {"NAME":"ESP32-DevKit","GPIO":[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1,0,0,0,0,1,1,1,1,1,0,0,1],"FLAG":0,"BASE":1}
00:00:31.901 RSL: RESULT = {"Module":{"1":"ESP32-DevKit"}}
00:00:32.110 RSL: RESULT = {"GPIO0":{"0":"None"},"GPIO1":{"0":"None"},"GPIO2":{"0":"None"},"GPIO3":{"0":"None"},"GPIO4":{"0":"None"},"GPIO5":{"0":"None"},"GPIO6":{"0":"None"},"GPIO7":{"0":"None"},"GPIO8":{"0":"None"},"GPIO9":{"0":"None"},"GPIO10":{"0":"None"},"GPIO11":{"0":"None"},"GPIO12":{"0":"None"},"GPIO13":{"0":"None"},"GPIO14":{"224":"Relay1"},"GPIO15":{"0":"None"},"GPIO16":{"0":"None"},"GPIO17":{"0":"None"},"GPIO18":{"0":"None"},"GPIO19":{"0":"None"},"GPIO20":{"0":"None"},"GPIO21":{"0":"None"},"GPIO22":{"0":"None"},"GPIO23":{"0":"None"},"GPIO24":{"0":"None"},"GPIO25":{"0":"None"},"GPIO26":{"0":"None"},"GPIO27":{"256":"Relay_i1"},"GPIO32":{"0":"None"},"GPIO33":{"0":"None"},"GPIO34":{"0":"None"},"GPIO35":{"0":"None"},"GPIO36":{"0":"None"},"GPIO37":{"0":"None"},"GPIO38":{"0":"None"},"GPIO39":{"0":"None"}}

• If using rules, provide the output of this command: Backlog Rule1; Rule2; Rule3:
  NOT using rules at all.
• Provide the output of this command: Status 0:

00:02:58.178 RSL: STATUS = {"Status":{"Module":1,"DeviceName":"Tasmota","FriendlyName":["Tasmota"],"Topic":"tasmota_AFAE54","ButtonTopic":"0","Power":"1","PowerLock":"0","PowerOnState":3,"LedState":1,"LedMask":"FFFF","SaveData":1,"SaveState":1,"SwitchTopic":"0","SwitchMode":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"ButtonRetain":0,"SwitchRetain":0,"SensorRetain":0,"PowerRetain":0,"InfoRetain":0,"StateRetain":0,"StatusRetain":0}}
00:02:58.215 RSL: STATUS1 = {"StatusPRM":{"Baudrate":115200,"SerialConfig":"8N1","GroupTopic":"tasmotas","OtaUrl":"http://ota.tasmota.com/tasmota32/release/tasmota32.bin","RestartReason":"Software reset CPU","Uptime":"0T00:02:59","StartupUTC":"","Sleep":50,"CfgHolder":4617,"BootCount":15,"BCResetTime":"1970-01-01T00:00:00","SaveCount":94}}
00:02:58.250 RSL: STATUS2 = {"StatusFWR":{"Version":"14.4.1(release-tasmota32)","BuildDateTime":"2024-12-15T13:33:17","Core":"3_1_0","SDK":"5.3.2","CpuFrequency":160,"Hardware":"ESP32-D0WD-V3 v3.1","CR":"407/699"}}
00:02:58.265 RSL: STATUS3 = {"StatusLOG":{"SerialLog":2,"WebLog":2,"MqttLog":0,"SysLog":0,"LogHost":"","LogPort":514,"SSId":["OpenWrt",""],"TelePeriod":300,"Resolution":"558180C0","SetOption":["00008009","2805C80001000600003C5A0A192800000000","00000080","00006000","00004000","00000000"]}}
00:02:58.309 RSL: STATUS4 = {"StatusMEM":{"ProgramSize":2017,"Free":862,"Heap":138,"StackLowMark":4,"PsrMax":0,"PsrFree":0,"ProgramFlashSize":4096,"FlashSize":4096,"FlashChipId":"1640C8","FlashFrequency":40,"FlashMode":"DIO","Features":["0809","9F9AD7DF","0015A001","B7F7BFCF","05DA9BC4","E0360DC7","480840D2","20200000","D4BC482D","810A80F1","00000014"],"Drivers":"1,2,!3,!4,!5,7,!8,9,10,11,12,!14,!16,!17,!20,!21,!24,26,!27,29,!34,!35,38,50,52,!59,!60,62,!63,!66,!67,!68,!73,!75,82,!86,!87,!88,121","Sensors":"1,2,3,5,6,7,8,9,10,11,12,13,14,15,17,18,19,20,21,22,26,31,34,37,39,40,42,43,45,51,52,55,56,58,59,64,66,67,74,85,92,95,98,103,105,109,127","I2CDriver":"7,8,9,10,11,12,13,14,15,17,18,20,24,29,31,36,41,42,44,46,48,58,62,65,69,76,77,82,89"}}
00:02:58.377 RSL: STATUS5 = {"StatusNET":{"Hostname":"tasmota-AFAE54-3668","IPAddress":"192.168.7.132","Gateway":"192.168.7.1","Subnetmask":"255.255.255.0","DNSServer1":"192.168.7.1","DNSServer2":"0.0.0.0","Mac":"A8:42:E3:AF:AE:54","IP6Global":"","IP6Local":"fe80::aa42:e3ff:feaf:ae54%st1","Ethernet":{"Hostname":"","IPAddress":"0.0.0.0","Gateway":"0.0.0.0","Subnetmask":"0.0.0.0","DNSServer1":"192.168.7.1","DNSServer2":"0.0.0.0","Mac":"00:00:00:00:00:00","IP6Global":"","IP6Local":""},"Webserver":2,"HTTP_API":1,"WifiConfig":4,"WifiPower":16.0}}
00:02:58.423 RSL: STATUS6 = {"StatusMQT":{"MqttHost":"","MqttPort":1883,"MqttClientMask":"DVES_%06X","MqttClient":"DVES_AFAE54","MqttUser":"DVES_USER","MqttCount":0,"MAX_PACKET_SIZE":1200,"KEEPALIVE":30,"SOCKET_TIMEOUT":4}}
00:02:58.442 RSL: STATUS7 = {"StatusTIM":{"UTC":"1970-01-01T00:02:58Z","Local":"1970-01-01T00:02:58","StartDST":"1970-01-01T00:00:00","EndDST":"1970-01-01T00:00:00","Timezone":"+00:00","Sunrise":"20:13","Sunset":"05:47"}}
00:02:58.461 RSL: STATUS10 = {"StatusSNS":{"Time":"1970-01-01T00:02:58"}}
00:02:58.471 RSL: STATUS11 = {"StatusSTS":{"Time":"1970-01-01T00:02:58","Uptime":"0T00:02:59","UptimeSec":179,"Heap":141,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":0,"Berry":{"HeapUsed":4,"Objects":47},"POWER":"ON","Wifi":{"AP":1,"SSId":"OpenWrt","BSSId":"A0:F3:C1:99:1B:3D","Channel":11,"Mode":"HT40","RSSI":96,"Signal":-52,"LinkCount":1,"Downtime":"0T00:00:04"}}}

• Set weblog to 4 and then, when you experience your issue, provide the output of the Console log:

00:01:54.830 CMD: weblog 4
00:01:54.832 RSL: RESULT = {"WebLog":4}
00:01:55.846 CFG: Saved, Count 101, Bytes 4096
00:01:57.656 SRC: WebGui from 192.168.7.109
00:01:57.660 RSL: RESULT = {"POWER":"OFF"}
00:01:57.661 RSL: POWER = OFF
00:01:57.816 CFG: Saved, Count 102, Bytes 4096
00:01:59.524 SRC: WebGui from 192.168.7.109
00:01:59.528 RSL: RESULT = {"POWER":"ON"}
00:01:59.529 RSL: POWER = ON
00:01:59.837 CFG: Saved, Count 103, Bytes 4096
00:02:07.944 WIF: Checking connection...
00:02:14.247 CMD: weblog 2
00:02:14.251 RSL: RESULT = {"WebLog":2}

TO REPRODUCE

1. Flash Tasmota32 onto a Sonoff Dual R3 device. (Probably this issue is present also in every other similar configuration)
2. Configure GPIO14 as Relay 1 and GPIO27 as Relay_i 1.
3. Observe that the relays do not function as expected.

EXPECTED BEHAVIOUR

I expect the relays operate in opposite states.
When GPIO14 is ON, GPIO27 should be inverted (OFF) and vice-versa.
Every time I press the "Toggle" button on web interface, I expect both relays change their states, always one opposite the other.

ADDITIONAL CONTEXT

Configuring GPIO14 as Relay 1 and GPIO27 as Led_i 1 brings the device to work as I want.
However, this is not the configuration I expected to use. Could someone explain me why the solution with Relay/Relay_i doesn't work? I haven't found any answers online.

Issue 8857 seems very similar to mine, but has been marked as a "question" and closed probably because it lacks information.

[sfromis]

You cannot configure both relay pins with the same index; you need a proper config instead. Using the Interlock command/feature sounds like what you're after.

[TheFax]

Thank you @sfromis for your advise.
Unfortunately 'interlock' is different from what I need.

Could you please help me to find the documentation that prohibits assigning the same index to multiple relay pins?

[sfromis]

It's just one of those very basic things. You can't have two relays be number 1, as Tasmota is based on having separate status and controls for each. And Interlock does give opposite states, as long as you do the switching by turning either one of them on. Not when you turn one of them off.

Yes, I know that you said "one web button", but a much more general thing is that the web UI is deliberately rudimentary, without it being the place to have tweaks, or at all use for "daily operation", which is expected to happen in your backend setup, not connecting a browser to each device.

Still, you could add a rule to do a thing like switching on relay 2 when detecting that relay 1 was switched off.