# Need someone to look at a bit of a flow for boot detection

**URL:** https://discourse.nodered.org/t/need-someone-to-look-at-a-bit-of-a-flow-for-boot-detection/28657
**Category:** General
**Created:** [20 June 2020 10:45 UTC](https://discourse.nodered.org/t/need-someone-to-look-at-a-bit-of-a-flow-for-boot-detection/28657 "2020-06-20T10:45:53Z")
**Posts on this page:** 4
**Page:** 1

<div class="post-metadata">

### Author: ![Trying\_to\_learn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/trying_to_learn/32/28400_2.png) [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [20 June 2020 10:45 UTC](https://discourse.nodered.org/t/need-someone-to-look-at-a-bit-of-a-flow-for-boot-detection/28657/1 "2020-06-20T10:45:53Z")

</div>

There are two parts to the flow.....  
(Well, a lot more but I shall keep it as simple as possible.)

There are foreign nodes - sorry - but they don't do that much important.

The idea:

Normally every _n_ seconds a pulse happens. A file is written to with the time and how long the machine has been running.

The machine boots.

This file is moved/renamed to a file which has the date/time in its name.

Then the original file I mentioned above is re-created with how long it has been running.

I thought I had it working, but today the machine had locked up and I had to power cycle it. ☹ (Headless.)

It booted but after it did all that, the file which was renamed/moved is empty.

I have changed a bit (see `comment` node `read me` for what I did.)

So here is the bits of the flow.

```auto
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alive.db`.","x":700,"y":1740,"wires":[]},{"id":"13174820.5236d8","type":"inject","z":"e2bd5a4e.5597e8","name":"Stop","topic":"control1","payload":"stop","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":"5","x":270,"y":1620,"wires":[["af18b37.e7cd95"]]},{"id":"f977b28.11b1b5","type":"inject","z":"e2bd5a4e.5597e8","name":"Go","topic":"control1","payload":"go","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":"5","x":270,"y":1660,"wires":[["af18b37.e7cd95"]]},{"id":"af18b37.e7cd95","type":"gate","z":"e2bd5a4e.5597e8","name":"NEW way","controlTopic":"control1","defaultState":"open","openCmd":"go","closeCmd":"stop","toggleCmd":"toggle","defaultCmd":"default","persist":false,"x":450,"y":1620,"wires":[["a8bf8fc2.8d44e"]]},{"id":"a5e09ecc.e66438","type":"link in","z":"e2bd5a4e.5597e8","name":"","links":["e9fdce0.b92183"],"x":405,"y":1540,"wires":[["ad49d2dc.adabd8"]]},{"id":"e9fdce0.b92183","type":"link out","z":"e2bd5a4e.5597e8","name":"","links":["a5e09ecc.e66438"],"x":745,"y":1790,"wires":[]},{"id":"d31af7be.40b82","type":"link out","z":"e2bd5a4e.5597e8","name":"","links":["36932a59.1deaae"],"x":1195,"y":1790,"wires":[]},{"id":"36932a59.1deaae","type":"link in","z":"e2bd5a4e.5597e8","name":"","links":["d31af7be.40b82"],"x":405,"y":1670,"wires":[["af18b37.e7cd95"]]},{"id":"3587609a.38ecc","type":"comment","z":"e2bd5a4e.5597e8","name":"Uptime display","info":"","x":280,"y":1370,"wires":[]},{"id":"474a4b8a.7edac4","type":"ui_group","z":"","name":"Up Time","tab":"173dcde5.96e88a","order":4,"disp":true,"width":"9","collapse":false},{"id":"23a81b35.dd43ac","type":"ui_group","z":"","name":"Main Menu Desktop machines","tab":"9d59e7da.0366c8","order":1,"disp":true,"width":"8","collapse":false},{"id":"173dcde5.96e88a","type":"ui_tab","z":"","name":"Local Readings","icon":"dvr","order":3,"disabled":false,"hidden":false},{"id":"9d59e7da.0366c8","type":"ui_tab","z":"","name":"Main Menu","icon":"list","order":1,"disabled":false,"hidden":false}]

```

The only _external_ thing you will see is at the top of the nodes `link in` is the pulse that is used as the signal to generate the time stamp.

 ![Screenshot from 2020-06-20 20-39-50](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/9/b96946f90cc3b4b27c3e4229cda5598d012ce2ee.png)

There are a couple of disabled nodes which are because I am playing with `CSS` and those nodes have been superseded.

There is a lot of _debug_ stuff. That is the lower right part. The `queue` nodes.

In the middle there are two `gate` nodes. Old way and New way.

(See the Read Me)

Basically the output from my subflow `timestamp` node started the `timer` node to turn on the `gate` node that allows writing to the `last alive` file. (Top right of the flow)

But I decided to maybe take the output signal from the `move` node that _Moves_ (renames) the file.

Still not tested.

Thanks in advance and I hope you understand what I want to do and how/why.

🙂

---

<div class="post-metadata">

### Author: ![afelix](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/afelix/32/9743_2.png) [@afelix](https://discourse.nodered.org/u/afelix)
#### Post date: [20 June 2020 11:01 UTC](https://discourse.nodered.org/t/need-someone-to-look-at-a-bit-of-a-flow-for-boot-detection/28657/2 "2020-06-20T11:01:43Z")

</div>

I haven't concentrated enough to attempt to understand your flow yet, apologies for that, but I'd like to ask why this approach? You could use the `crontab` of the machine, and start a command at (re)boot time as executed and have it write the timestamp that way. Then in node-red read it out/do something with it. It might be more stable than the flow you use here.  
This is a good tutorial on how to use `@reboot /path/to/command` in crontab on a linux system such as a pi.

> **[A super-simple way to run scripts on boot](https://learn.pimoroni.com/article/running-scripts-at-boot)**
>
> Use cron to run scripts on boot on your Raspberry Pi – Pimoroni Learning Portal

Additionally,

> [@](#):
>
> Note: The day of a command's execution can be specified by two fields — day of month, and day of week. If both fields are restricted (i.e., don't start with \*), the command will be run when either field matches the current time. For example, "30 4 1,15 \* 5" would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday. One can, however, achieve the desired result by Instead of the first five fields, one of eight special strings may appear:
> 
> ```auto
> string meaning
> ------ -------
> @reboot Run once, at startup.
> @yearly Run once a year, "0 0 1 1 *".
> @annually (same as @yearly)
> @monthly Run once a month, "0 0 1 * *".
> @weekly Run once a week, "0 0 * * 0".
> @daily Run once a day, "0 0 * * *".
> @midnight (same as @daily)
> @hourly Run once an hour, "0 * * * *".
> 
> ```
> 
> Please note that startup, as far as @reboot is concerned, is the time when the cron(8) daemon startup. In particular, it may be before some system daemons, or other facilities, were startup. This is due to the boot order sequence of the machine.

---

<div class="post-metadata">

### Author: ![Trying\_to\_learn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/trying_to_learn/32/28400_2.png) [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [20 June 2020 11:24 UTC](https://discourse.nodered.org/t/need-someone-to-look-at-a-bit-of-a-flow-for-boot-detection/28657/3 "2020-06-20T11:24:53Z")

</div>

The problem is that the name of the file is created in NR. So, I guess it could be done but it would require me to learn more on that part of things.

This is/was something I wrote a fair while ago. I have just _tweaked_ it to be a bit better.

This is an example of what the file looks like:

```auto
2020-06-20 21:23:07
up 1 hour, 20 minutes

```

And although this points the finger that the code is the problem.

But.....

```auto
-rw-r--r-- 1 pi pi 51 May 14 15:38 Rebooted at 2020-05-14 154015.db
-rw-r--r-- 1 pi pi 60 May 21 10:11 Rebooted at 2020-05-21 102158.db
-rw-r--r-- 1 pi pi 34 May 21 10:23 Rebooted at 2020-05-21 104603.db
-rw-r--r-- 1 pi pi 52 May 27 23:31 Rebooted at 2020-05-27 233350.db
-rw-r--r-- 1 pi pi 50 May 28 18:29 Rebooted at 2020-05-28 183145.db
-rw-r--r-- 1 pi pi 60 May 31 13:41 Rebooted at 2020-05-31 134335.db
-rw-r--r-- 1 pi pi 61 Jun 2 09:07 Rebooted at 2020-06-02 082015.db
-rw-r--r-- 1 pi pi 52 Jun 9 13:39 Rebooted at 2020-06-09 134200.db
-rw-r--r-- 1 pi pi 61 Jun 15 00:33 Rebooted at 2020-06-15 003604.db
-rw-r--r-- 1 pi pi 0 Jun 20 19:49 Rebooted at 2020-06-20 192105.db

```

So for some reason the rename got corrupted.

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [19 August 2020 11:29 UTC](https://discourse.nodered.org/t/need-someone-to-look-at-a-bit-of-a-flow-for-boot-detection/28657/4 "2020-08-19T11:29:40Z")

</div>

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