node-red-contrib-resend-last-msg 1.1.1

Resend last message received

npm install node-red-contrib-resend-last-msg

node-red-contrib-resend-last-msg

A lightweight Node-RED node that allows you to resend the last received message by pressing a simple button. Especially useful for diagnostics.

Installation

You can install this node using the Node-RED palette manager:

1. Open Node-RED
2. Navigate to Manage Palette > Install
3. Search for node-red-contrib-resend-last-msg and install it

Alternatively, install it manually using npm:

npm install node-red-contrib-resend-last-msg

Run this command in your Node-RED user directory (typically ~/.node-red).

Usage

When this node receives a msg via input, it will:

• Pass it through to the output
• Store the message using a deep clone

The node will resend the last received message when the button is pressed.

Options:

• Resend only msg.payload (optional)
• Message Counter: The node counts received messages, and the counter can reset automatically based on configured time and days of the week.

Node Control (Version >= 1.1.0)

The node can also be controlled via an incoming message using msg._ResendLastMsg. This control property is not forwarded by the Resend Node.

1. Resend Last Message

Resend the entire message:

msg._ResendLastMsg = {
    "resend": true
}

Resend only msg.payload:

msg._ResendLastMsg = {
    "resend": "payload"
}

Resend a specific property, e.g., msg.otherMsg:

msg._ResendLastMsg = {
    "resend": "otherMsg"
}

2. Reset Stored Message

Resets the stored message and counter:

msg._ResendLastMsg = {
    "reset": true
}

3. Set Counter

Sets the message counter to a specific number:

msg._ResendLastMsg = {
    "setCounter": 10
}

• The setCounter option can be used together with other control options.
• It accepts only positive numbers; otherwise, it defaults to 0.

Example Flow

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*","x":545,"y":1200,"wires":[["8fba11ffe589acaf"]],"l":false},{"id":"f20de8b47f441836","type":"inject","z":"4ba6e23a9c2f889b","name":"Send","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":150,"y":1200,"wires":[["fbe4bbb65988e829"]]},{"id":"fbe4bbb65988e829","type":"function","z":"4ba6e23a9c2f889b","name":"Resend All","func":"msg._ResendLastMsg = {\n    resend: true,   // will resend entire msg\n}\n\n\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":290,"y":1200,"wires":[["f212fd37654926cc"]]},{"id":"e4e55ce091a87ee4","type":"inject","z":"4ba6e23a9c2f889b","name":"Send","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":150,"y":1380,"wires":[["bbc7a8acb76a69e4"]]},{"id":"bbc7a8acb76a69e4","type":"function","z":"4ba6e23a9c2f889b","name":"Reset Msg","func":"msg._ResendLastMsg = {\n    reset: true, // reset (delete) entire stored msg and set counter to 0\n}\n\n\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":290,"y":1380,"wires":[["f212fd37654926cc"]]},{"id":"c3cf1e27e9304a28","type":"inject","z":"4ba6e23a9c2f889b","name":"Generate Payload Only","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":240,"y":1120,"wires":[["f212fd37654926cc"]]},{"id":"33de9c16e24f8a1c","type":"inject","z":"4ba6e23a9c2f889b","name":"Send","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":150,"y":1280,"wires":[["6407db61b7b27616"]]},{"id":"6407db61b7b27616","type":"function","z":"4ba6e23a9c2f889b","name":"otherMsg Only","func":"msg._ResendLastMsg = {\n    resend: 'otherMsg', // will resend only msg.otherMsg\n}\n\n\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":300,"y":1280,"wires":[["f212fd37654926cc"]]},{"id":"2ec40bfbe5d41840","type":"inject","z":"4ba6e23a9c2f889b","name":"Send","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":150,"y":1460,"wires":[["77019a09790b2c04"]]},{"id":"77019a09790b2c04","type":"function","z":"4ba6e23a9c2f889b","name":"Combined Options","func":"msg._ResendLastMsg = {\n    resend: true,\n    setCounter: 20,   \n}\n\n\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":310,"y":1460,"wires":[["f212fd37654926cc"]]},{"id":"6f89ef4930c39348","type":"inject","z":"4ba6e23a9c2f889b","name":"Send","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":150,"y":1520,"wires":[["1b762a0c92fe5231"]]},{"id":"1b762a0c92fe5231","type":"function","z":"4ba6e23a9c2f889b","name":"Invalid Msg","func":"msg._ResendLastMsg = {} // invalid config message (must have at least one key)\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":290,"y":1520,"wires":[["f212fd37654926cc"]]},{"id":"1caf71f8cc8dcd45","type":"inject","z":"4ba6e23a9c2f889b","name":"Send","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":150,"y":1240,"wires":[["d6a12d45572735f6"]]},{"id":"d6a12d45572735f6","type":"function","z":"4ba6e23a9c2f889b","name":"Payload Only","func":"msg._ResendLastMsg = {\n    resend: 'payload',  // will resend only msg.payload\n}\n\n\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":290,"y":1240,"wires":[["f212fd37654926cc"]]},{"id":"ffc2c14fd266379d","type":"function","z":"4ba6e23a9c2f889b","name":"Set Counter","func":"msg._ResendLastMsg = {\n    setCounter: 10,\n}\n\n\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":290,"y":1420,"wires":[["f212fd37654926cc"]]},{"id":"a411696ba0fe85fa","type":"inject","z":"4ba6e23a9c2f889b","name":"Send","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":150,"y":1320,"wires":[["1cdf57a6e9421246"]]},{"id":"1cdf57a6e9421246","type":"function","z":"4ba6e23a9c2f889b","name":"Invalid Key","func":"msg._ResendLastMsg = {\n    resend: 'abcd',  // msg.abcd does not exist and will trigger an error\n}\n\n\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":290,"y":1320,"wires":[["f212fd37654926cc"]]},{"id":"b8fda9f8df9c403b","type":"inject","z":"4ba6e23a9c2f889b","name":"Send","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":150,"y":1420,"wires":[["ffc2c14fd266379d"]]}]

License

Licensed under the Apache License 2.0.