# Multi udp in-out

**URL:** <https://discourse.nodered.org/t/multi-udp-in-out/83087>\
**Category:** General\
**Tags:** home-assistant, udp\
**Created:** [22 November 2023 10:09 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087 "2023-11-22T10:09:48Z")\
**Posts on this page:** 20\
**Page:** 1

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 10:09 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/1 "2023-11-22T10:09:48Z")

</div>

Hi everuone! I have an power supply uses UDP porotocol. I has multi UDP request for the power supply and i need separate answer from the power supply (answer looks like number - 20.00). Will be good if i can transmit into UDP used subport. And i can transmited the packet from sub-ports.  
Now i hase:

 ![изображение](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/7/679163075ec60c345f8710d25907dc400ef71c03.jpeg)  
I want:  
 ![изображение](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/3/9/39e5964005d6fac3bab662ae1f92390e0dd48ef1.png)

---

<div class="post-metadata">

**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [22 November 2023 10:24 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/2 "2023-11-22T10:24:32Z")

</div>

Sorry, It's not clear to me what you are asking for... but do you mean this

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/d/5df68e3474254964f75afdac74a6747d967e7cbd.png)  
which lets you use a single node and send it the ip and port dynamically.

You do need to configure listening input ports in advance.

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 10:28 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/3 "2023-11-22T10:28:59Z")

</div>

> [@dceejay](#):
>
> Sorry, It's not clear to me what you are asking for... but do you mean this
> 
> ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/d/5df68e3474254964f75afdac74a6747d967e7cbd.png)
> 
> which lets you use a single node and send it the ip and port dynamically.
> 
> You do need to configure listening input ports in advance.

Now i send to UDP port command and I am listening to the port to which all the data comes. I cannot distinguish them among myself. I need separate the UDP packages.

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 10:35 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/4 "2023-11-22T10:35:36Z")

</div>

Sorry it's still not overly clear.

Are you trying to match up a UDP packet response, to a UDP packet request?

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 10:36 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/5 "2023-11-22T10:36:12Z")

</div>

> [@marcus-j-davies](#):
>
> Are you trying to match up a UDP packet response, to a UDP packet request?

Yes, it is.

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 10:43 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/6 "2023-11-22T10:43:43Z")

</div>

Ok,

This isn't really a thing that the UDP node should be responsible for.  
You need to create a flag in your flow design, so you know what the next response should be.

i.e You want to request voltage.

1. Set a property in flow context, example **expectedResponseType** = **Voltage**
2. Send request
3. Check **expectedResponseType** when you receive a UDP payload, and route the data accordingly based on what the **expectedResponseType** is currently set to.

This will be trivial with a **switch** node

UDP is statless, therefore you need to poly fill this behaviour, where as TCP can do Req/Res

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 10:50 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/7 "2023-11-22T10:50:05Z")

</div>

> [@userd](#):
>
> I'm not sure that I understood you.  
> I cannot form a UDP response from the device. In response, only numbers are returning to me.  
> I don't understand how I can SET A Property in Flow Context

I'm not sure that I understood you.  
I cannot form a UDP response from the device. In response, only numbers are returning to me.  
I don't understand how I can SET A Property in Flow Context

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 10:56 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/8 "2023-11-22T10:56:05Z")

</div>

A brief example, of what I think you are trying to achieve, but it is just a guess

```auto
[{"id":"e8d2c519dd678ff7","type":"inject","z":"e52e1875b36bafbd","name":"Request Voltage","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":235,"y":180,"wires":[["4b6ee7ef8acd3666"]]},{"id":"d3d99acd4e77dcd8","type":"inject","z":"e52e1875b36bafbd","name":"Request Current","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":230,"y":250,"wires":[["0a8d045a934330f2"]]},{"id":"4b6ee7ef8acd3666","type":"change","z":"e52e1875b36bafbd","name":"","rules":[{"t":"set","p":"expectedResponeType","pt":"flow","to":"Voltage","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":510,"y":200,"wires":[["e1ad93968a3dc303"]]},{"id":"0a8d045a934330f2","type":"change","z":"e52e1875b36bafbd","name":"","rules":[{"t":"set","p":"expectedResponeType","pt":"flow","to":"Current","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":510,"y":240,"wires":[["e1ad93968a3dc303"]]},{"id":"e1ad93968a3dc303","type":"udp out","z":"e52e1875b36bafbd","name":"","addr":"","iface":"","port":"","ipv":"udp4","outport":"","base64":false,"multicast":"false","x":855,"y":220,"wires":[]},{"id":"4880e234d3e3de03","type":"udp in","z":"e52e1875b36bafbd","name":"","iface":"","port":"","ipv":"udp4","multicast":"false","group":"","datatype":"buffer","x":225,"y":415,"wires":[["08ced2919260265d"]]},{"id":"08ced2919260265d","type":"switch","z":"e52e1875b36bafbd","name":"Check expectedResponeType","property":"expectedResponeType","propertyType":"flow","rules":[{"t":"eq","v":"Voltage","vt":"str"},{"t":"eq","v":"Current","vt":"str"}],"checkall":"true","repair":false,"outputs":2,"x":465,"y":415,"wires":[["dbe9a59add537707"],["9e31c5049bdadd3c"]]},{"id":"dbe9a59add537707","type":"debug","z":"e52e1875b36bafbd","name":"Voltage Response","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":800,"y":385,"wires":[]},{"id":"9e31c5049bdadd3c","type":"debug","z":"e52e1875b36bafbd","name":"Current Response","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":800,"y":435,"wires":[]}]

```

 ![Screenshot 2023-11-22 at 10.55.20](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/9/79e6369f7924e919d01324ff510537693e63904d.png)

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 11:07 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/9 "2023-11-22T11:07:13Z")

</div>

> [@marcus-j-davies](#):
>
> A brief example, of what I think you are trying to achieve, but it is just a guess

I work with an device.  
The device returns only numbers to requests. They are no different from each other (between current and tension, these are numbers). Upon receipt, I want to send these numbers to the sensors. The resulting current value is on the current sensor, the obtained voltage value - to the voltage sensor.

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 11:10 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/10 "2023-11-22T11:10:24Z")

</div>

and you request each value separately? and receive them separately?  
or does one request yield all values (Current, Voltage etc etc)

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 11:23 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/11 "2023-11-22T11:23:21Z")

</div>

Yes, I equest each value separately and receive them separately. But I can not form a response command from the current source, these are just numbers

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 11:37 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/12 "2023-11-22T11:37:40Z")

</div>

> [@userd](#):
>
> But I can not form a response command from the current source

What does this mean?  
send the data to Home Assistance in the correct format?

if so, I suggest speaking to the HA forums - most here do not use HA.

NOTE: I have moved this thread away from Feature Request.

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 11:46 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/13 "2023-11-22T11:46:32Z")

</div>

> [@marcus-j-davies](#):
>
> What does this mean?  
> send the data to Home Assistance in the correct format?
> 
> if so, I suggest speaking to the HA forums - most here do not use HA.
> 
> NOTE: I have moved this thread away from Feature Request.

I do not control the return parcels from the power supplay. I send to UDP port ISET?\n or VSET?\n for asks I or V. I receive retaliatory parcels - 20.00 or 10.00. I can't distinguish where V is I - it is the problem,

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 11:53 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/14 "2023-11-22T11:53:10Z")

</div>

Ok we seem to be going around in circles..

When you request/set values, and you receive the response, and need to determine what response this is for (V, I)

Then I have already provided 1 possible solution.

The `switch` node will output the values down the correct wire based on what was requested / set  
so connect your HA Nodes to the correct outputs

> [@marcus-j-davies](#):
>
> A brief example, of what I think you are trying to achieve, but it is just a guess
> 
> ```auto
> [{"id":"e8d2c519dd678ff7","type":"inject","z":"e52e1875b36bafbd","name":"Request Voltage","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":235,"y":180,"wires":[["4b6ee7ef8acd3666"]]},{"id":"d3d99acd4e77dcd8","type":"inject","z":"e52e1875b36bafbd","name":"Request Current","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":230,"y":250,"wires":[["0a8d045a934330f2"]]},{"id":"4b6ee7ef8acd3666","type":"change","z":"e52e1875b36bafbd","name":"","rules":[{"t":"set","p":"expectedResponeType","pt":"flow","to":"Voltage","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":510,"y":200,"wires":[["e1ad93968a3dc303"]]},{"id":"0a8d045a934330f2","type":"change","z":"e52e1875b36bafbd","name":"","rules":[{"t":"set","p":"expectedResponeType","pt":"flow","to":"Current","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":510,"y":240,"wires":[["e1ad93968a3dc303"]]},{"id":"e1ad93968a3dc303","type":"udp out","z":"e52e1875b36bafbd","name":"","addr":"","iface":"","port":"","ipv":"udp4","outport":"","base64":false,"multicast":"false","x":855,"y":220,"wires":[]},{"id":"4880e234d3e3de03","type":"udp in","z":"e52e1875b36bafbd","name":"","iface":"","port":"","ipv":"udp4","multicast":"false","group":"","datatype":"buffer","x":225,"y":415,"wires":[["08ced2919260265d"]]},{"id":"08ced2919260265d","type":"switch","z":"e52e1875b36bafbd","name":"Check expectedResponeType","property":"expectedResponeType","propertyType":"flow","rules":[{"t":"eq","v":"Voltage","vt":"str"},{"t":"eq","v":"Current","vt":"str"}],"checkall":"true","repair":false,"outputs":2,"x":465,"y":415,"wires":[["dbe9a59add537707"],["9e31c5049bdadd3c"]]},{"id":"dbe9a59add537707","type":"debug","z":"e52e1875b36bafbd","name":"Voltage Response","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":800,"y":385,"wires":[]},{"id":"9e31c5049bdadd3c","type":"debug","z":"e52e1875b36bafbd","name":"Current Response","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":800,"y":435,"wires":[]}]
> 
> ```
> 
> ![Screenshot 2023-11-22 at 10.55.20](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/9/79e6369f7924e919d01324ff510537693e63904d.png)

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 11:59 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/15 "2023-11-22T11:59:14Z")

</div>

> [@marcus-j-davies](#):
>
> Ok we seem to be going around in circles..
> 
> When you request/set values, and you receive the response, and need to determine what response this is for (V, I)
> 
> Then I have already provided 1 possible solution.
> 
> The `switch` node will output the values down the correct wire based on what was requested / set  
> so connect your HA Nodes to the correct outputs

Ok. I will test it. Where can i past the code inside a node?

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 12:01 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/16 "2023-11-22T12:01:09Z")

</div>

Import the JSON I provided, and of course modify to your environment.

![Screenshot 2023-11-22 at 12.00.14](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/e/a/ea3245c64f1824b1aad13a1f243cec41c73cd10f.png)

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 12:15 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/17 "2023-11-22T12:15:26Z")

</div>

> [@marcus-j-davies](#):
>
> Ok we seem to be going around in circles..
> 
> When you request/set values, and you receive the response, and need to determine what response this is for (V, I)
> 
> Then I have already provided 1 possible solution.
> 
> The `switch` node will output the values down the correct wire based on what was requested / set  
> so connect your HA Nodes to the correct outputs

In debag i can see Current value and voltage. But think see only I, for example.

 ![изображение](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/1/1/11604835e92d1787dad04f08e51e13dda87d8c9b.png)

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 12:28 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/18 "2023-11-22T12:28:50Z")

</div>

Because you're requesting both values at the same time, so is therefore overwriting the `responseType` flag, before the first has finished.

You need to wait for 1 response before issuing another in this case.

This is just the nature of UDP, you need to manage data flow your self.

Example

1. Request V or I
2. When V Or I has responded send the request for the other value.

 ![Screenshot 2023-11-22 at 12.28.04](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/e/bee3d209e01c3e7ae2cfdd715e8fe96ce2b7136d.png)

Or use something like my semaphore node.  
where the 2nd request will not allow to proceed until the first has been satisfied.

but that will require a different approach

> **[@marcus-j-davies/node-red-semaphore-plus](https://flows.nodered.org/node/@marcus-j-davies/node-red-semaphore-plus)**
>
> An advanced set of semaphore Nodes for Node RED, with a dynamic fail-safe

---

<div class="post-metadata">

**Author:** ![userd](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/userd/32/85093_2.png) [@userd](https://discourse.nodered.org/u/userd)\
**Post date:** [22 November 2023 12:42 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/19 "2023-11-22T12:42:00Z")

</div>

> [@marcus-j-davies](#):
>
> Because you're requesting both values at the same time, so is therefore overwriting the `responseType` flag, before the first has finished.
> 
> You need to wait for 1 response before issuing another in this case.
> 
> This is just the nature of UDP, you need to manage data flow your self.
> 
> Example
> 
> 1. Request V or I
> 2. When V Or I has responded send the request for the other value.

Can you send to me code it. I can't see that inside all the nodes.

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [22 November 2023 12:50 UTC](https://discourse.nodered.org/t/multi-udp-in-out/83087/20 "2023-11-22T12:50:50Z")

</div>

```auto
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```

**Caution!!!**  
This will loop, so **DON'T** request another value once you have the 2nd

it doesn't have anything In the way of quality control  
so just remove the request for the 2nd V

 ![Screenshot 2023-11-22 at 13.00.03](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/1/8/187f59b67861e32483c70e84438c9d32e04836f5.png)

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