I was developing a solution with multiple flows (eleven) on a Raspberry Pi 4 and reached a point with the visual editor was going out to lunch for extended periods of time. So I restarted node red in safe mode and exported each flow individually.
I then deleted all the flows and re-imported the first one that had a GUI and the UI web page would not display and the environment was still sluggish.
So I totally recreated the environment from scratch to start over again. Verified that the visual editor and UI web page was functional.
I then started importing my individual flows and was soon back to the point of the response time being very slow.
So I recreate the environment again and start to import my flows again, concentrating on the oldest most mature flows.
I was importing the individual flows as new flows each time. I noticed that each flow had to have a MQTT node reconfigured. After getting in two flows that used MQTT I noticed that each flow would oscillate between connected and disconnected for the MQTT nodes in the visual editor.
I then visited the hamburger and configuration nodes to see that there was multiples for mqtt-broker, so I deleted the extra configuration.
This causes the flow that the used the configuration to report an error on the MQTT nodes and have the mqtt host selection removed.
I then configured these nodes to point to the same broker configuration and redeployed.
This did not fix the oscillate between connected and disconnect problem.
Here are the flows that demonstrate the problem.
Hydronic heating GUI
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Pi","usetls":false,"compatmode":false,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"74343ae5.9cb4b4","type":"ui_tab","z":"","name":"Hydronic Heating","icon":"dashboard","order":2,"disabled":false,"hidden":false}]
Hydronic Heating Relays
[{"id":"b67332d2.6d629","type":"tab","label":"Hydronic Heating Relays","disabled":false,"info":"# Hydronic Heating Relay Control Flow\n\nThis flow manages the interactions between the MQTT broker and implements the required functionality.\n\nDesign objectives:\n\n - MQTT Centric in that all state information and events are persisted or orginated from MQTT\n - Allow manual over-ride of the activation of zones.\n - React to MQTT requests from other sources like HomeAssistant, Alexia or other flows.\n\n"},{"id":"40bae63c.d364c8","type":"mqtt in","z":"b67332d2.6d629","name":"MQTT Hydronic Heating","topic":"hydronic/#","qos":"2","datatype":"auto","broker":"7e5d3078.0d6f1","x":130,"y":80,"wires":[["cfe9b032.6e859","bccd213b.9d51e"]]},{"id":"9e2a424a.27a35","type":"comment","z":"b67332d2.6d629","name":"Hydronic Relay Control","info":"# Hydronic Heating Control Relays\n\nThe house raspberry pi located in the plumbing/electrical bay has numerous relays to control the functionality of Hydronic heating system.\n\nThere are six heating zones for:\n\n - Zone 1: Bedroom heater pump and fan\n - Zone 2: Bathroom heater pump and fan\n - Zone 3: Kitchen heater pump and fan\n - Zone 4: Living room heater pump.\n - Zone 5: Forward two bays freeze protection pump and fans\n - Zone 6: Rear two bays freeze protection pump and fans\n\nThere are three additional pumps for:\n\n - Stir/Circulation pump to even out temperature between the two heat storage tanks and provide hot coolant flow for the heat exchanger that provides hot water.\n - Pump for Engine preheating and thermosiphon heat recovery\n - Pump for Generator preheating and thermosiphon heat recovery\n - \n\nThere is an additional relay functionality to:\n\n - Turn on the diesel boiler\n - Control electric ball valve to force flow through the diesel boiler when it is on, bypass when off\n\nNote this last functionality is implemented with one control signal from the Raspberry Pi, driving three SPDT relays.\n\nFor the basic heart of the hydronic system there are three temperature sensors for:\n\n - hydronic tank output\n - engine heater circuit coolant\n - generator heater circuit coolant\n\nThe last two sensors are used the preheating and the thermosiphon heat recovery functionality.\n\n","x":120,"y":40,"wires":[]},{"id":"bbbbecca.9a93b","type":"switch","z":"b67332d2.6d629","name":"Switch Control 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The MQTT server is on the same host and access at 127.0.0.1 with login credentials.
The node red environment has the dashboard and RPI nodes installed.
I also tested with a separate node red installation that wasn't on a raspberry. Other then having to delete the rpi nodes in the second flow after import. I saw the same problem.
