Esp32 dhcp hostname

you tell you mistaken. Not essence..

Esp32 dhcp hostname

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To test this functionality, we will first connect the ESP32 to a WiFi network and then obtain the hostname. The hostname should be correctly resolved to the ESP32 IP and thus the machine should be able to ping the it and receive an answer. We will start the code by including the WiFi. Naturally, we will also need the WiFi network credentials, more precisely the network name and password. Moving on to the Arduino setup, we will initialize the serial interface, so we can output the hostname we will obtain.

Then we will call the begin method on the WiFi extern variable, to start the connection to the WiFi network. This method receives as first input the network name and as second input its password. We can obtain the status of the connection by calling the status method on the WiFi variable.

ESP-IDF: ESP32 Setting Hostname

Finally, to obtain the hostname, we simply need to call the getHostname method of the WiFi variable. This method takes no arguments and returns as output the hostname as a string. You can check the implementation of this method here. To test the code, start by compiling it and uploading it to your device using the Arduino IDE.

After that, you should get an output like the one on figure 1, which shows the hostname getting printed to the console. Above, we also have the local IP assigned to the device on the network. To do it, open a command line on a machine connected to the same network and send the following command:. As shown in figure 2, the hostname used in the command should be resolved to the actual IP of the ESP32 on the network note that it matches the IP obtained on figured 1.

Thus, the ESP32 should successfully answer the ping request. Figure 2 — Pinging the ESP32 using its hostname. Even though it seems to be possible to set it on the ESP32 side the next calls to the getHostname will return the new oneI cannot seem to, for example, ping the ESP32 on the new hostname. Skip to content.

Introduction In this tutorial we will learn how to obtain the hostname of the ESP32, using the Arduino core. The code We will start the code by including the WiFi.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I don't want to use this hostname, so I've opted to change it as follows:. Of course, this isn't working. That way I can register a handler to set the hostname.

The Espressif WiFi Driver Guide here indicates a task is launched - so there is probably an event right:. Well I cannot find any such events. However, the hostname still hasn't changed. Therefore I find myself a bit stuck. How can I actually change the hostname? I've found little to no results from searching this problem. However, the esp32 is a popular module and I'm sure many other people will find themselves facing the same problem. Turns out I was doing it correctly. It was my router that had failed to refresh the hostname adequately.

For consistency I will restate what I did to solve this problem:. The generation of this event also means that the event task will initialize the LwIP network interface netif. Here is an example of a handler that does that, taken right from their example:. In this example I get the hostname after setting it, and print it to stdout. You can validate it if you are running the monitor for the ESP The hostname set will be the one visible from the router page.

Learn more.Official boards are the Adafruit Huzzah and Feather boards. The work involved didn't look too bad so I went ahead and implemented something see this commit in my fork.

I wanted to get feedback to see if others thought this might be worthy of opening a pull request for. WLAN network. Unlike the other parameters it isn't persisted across boots, but as far as I could tell this is just due to how the ESP SDK call works.

Another downside is that setting the hostname has to happen before a DHCP address is requested makes senseso you have to reset the station connection after changing it. You do not have the required permissions to view the files attached to this post. Last edited by chrisgp on Tue Nov 08, pm, edited 2 times in total.

Definitely in favor! If you have any feedback feel free to add a comment to the pull request. It exposes it as a hostname parameter in network. I even follow u method call sta. I opened a request to bring in the changes but that is currently pending so it's not in the master branch yet. Unless there is additional feedback it looks like it might be available in the 1.Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications.

Skip to content. Is there anything in esp-idf to change this default name? My esp32 should have the same name in each network without having to rename in router. If you search for that keyword in the docs you will find the usage instructions.

The one possible wild guess I have is that the access point "remembers" the first name for a given MAC address that it finds. Looking there, I seem to see a list of all the previous devices that have ever connected including their MAC addresses and "Device Name". It is in the realms of possibility that if we rebooted our access points and THEN tried a connection with a new host name, then it might work.

Another puzzle to me is the purpose of this interface host name. This thread begins with the title of "changing dnsName" I'm not sure what effect "supplying" a name here actually has.

Dynamic lookup of names might be performed through mDNS. I don't believe that if we were to say "ping espressif" it would resolve. I don't think access points run DNS servers. So that would be quite fast. Best, Malte. So if desired the component would listen on all mDNS broadcasts and caches the information.

Jump to. All times are UTC Top. About Us Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. Espressif ESP Available now!GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project?

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esp32 dhcp hostname

Hi, I've noticed that somehow I guess recently? Anyone that can guide us on how to properly set the ESP32 host names? This probably should be looked at upstream. If you add this file into your sketch folder, you could write some code to give each machine a unique name.

You can set the hostname before calling wifi.

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You just need to set the mode first. Then you should get a unique hostname. But that is good practice to set a unique hostname. As you can see from the tcpdump on the router running openwrt, the gateway, the only DHCP server in the networkthere is no hostname sent.

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Please see tha ascii dump as well. No "espressif" or anything. Something has changed maybe in the latest code? Or we need to enable the hostname sending?

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Move wifi. Same: Fri Mar 8 daemon. I don't know if toCharArray is mangling it somehow,but I have definitely seen invalid names non-printable chars come through while watching a tcpdump on the router.

This is working for me:. I have also tried every imaginable position of doing the setHostName call:. As a result, the router FritzBox lists the WiFi device as "espressif" instead of the desired hostname it's not clear to me where this "espressif" name comes from, because I don't see that anywhere in the DHCP Request either and the built-in DNS server does not create a record for the hostname. I'm not very familiar with esp-idf project.

Is it another fork? Is it an substitute? Is it part of this project? Your declaration worked because the compiler did append a null, else it would complain about type mismatch. If you changed the declaration to 13 characters char hname[13] the compiler would have complained because of a type mis-match.

tcpdump -Anev -s 1024 -i br-lan port 67 or port 68 or port 69

Now it does, probably i overlooked something due to the late hours. Both the esp32 and the dhcp server need to see this as a new event. Ultimately, it is up to the dhcp server to report new dns names, so there will be many situations where this will never work. This bug is a little bit tricky, because it doesn't appear in every operational state. If the in-memory stored previous dhcp lease is e. That's maybe the reason why it worked for some of you "sometimes".

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This can be done e.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. This problem only seems to occur with the ESP My ESP modules set the hostname correctly.

I've tried various combinations of dev and stable for both arduino and esphome without any luck. This looks identical to Issue 64 which was closed. Additional information and things you've tried: I've tried various combinations of dev and stable for both arduino and esphome without any luck.

esp32 dhcp hostname

The ESP modules do not have this issue. This looks identical to issue 64 which was closed.

ESP32 Arduino: Getting station interface hostname

It doesn't sound identical because before the hostname was espressifnot an empty string. What could be an issue is the hostname itself: I don't remember the exact requirements for hostnames, but I think there was a length limit. Maybe this is the case here. I don't believe that's it. I've got an ESP that has a 21 character name without any issues. The one above is shorter than that. Oddly enough, the first time it booted it gave the hostname successfully.

esp32 dhcp hostname

Subsequent DHCP renews were lacking the correct hostname and it happened after it'd been up for about 12 hours. The expressif name rings a bell though: it switched from the hostname, to "expressif", to no name at all. To test this further and remove any chance of a funky MAC association, I just unplugged the ESP32, plugged in a brand new one, and reflashed it with the exact same yaml:.

It assigned the espressif name even though I've got the other hostname in the config. Let me know if there's anything you'd like me to test. With the latter, it looks pretty close to the previous issue. Alright, one more update: it seemed to have registered the hostname in the last few hours. It definitely isn't doing it on the initial flash though.

I flashed it again and the name showed up in the DHCP request correctly.

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Could this be some odd timing issue? Could be, but in that case it would definitely be an upstream issue in esp-idf. ESPHome just tells the SDK that the hostname is X, and esp-idf handles all the internals which are also closed source so no way we can fix it. On the first connect attempt, the hostname is correctly set after the DHCP config call. However after that they are no longer set. Not sure if this is really the case but setting the hostname again after each config call can't hurt either.

Adding it to the code. Just found this issue with my brand new esp32 - it's not requesting a DHCP hostname correctly. It looks like it only works for the initial offer and then never asks for the hostname again.

Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.Support an Espressif-specific protocol which, in turn, supports up to 1 km of data traffic.

Generally, the most effective way to begin your own Wi-Fi application is to select an example which is similar to your own application, and port the useful part into your project. It is not a MUST but it is strongly recommended that you take some time to read this article first, especially if you want to program a robust Wi-Fi application.

This article also reveals some design details of the Wi-Fi driver. Whether the error is critical or not depends on the API and the application scenario, and it is defined by the API user. The primary principle to write a robust application with Wi-Fi API is to always check the error code and write the error-handling code.

Generally, the error-handling code can be used:. You can detect this kind of error very quickly in the application development phase. It is a rather commonplace error-handling code and can be used as the default error-handling code in the application development phase. However, we strongly recommend that API users write their own error-handling code. When initializing struct parameters for the API, one of two approaches should be followed: - explicitly set all fields of the parameter or - use get API to get current configuration first, then set application specific fields.

Initializing or getting the entire structure is very important because most of the time the value 0 indicates the default value is used.

More fields may be added to the struct in the future and initializing these to zero ensures the application will still work correctly after IDF is updated to a new release. Wi-Fi driver receives API calls, handles them, and post events to the application. Events are sent by the Wi-Fi driver to the default event loop. The Wi-Fi driver will never generate this event, which, as a result, can be ignored by the application event callback. This event may be removed in future releases.

The scan is completed, e. A new scan will override the current scan and a scan-done event will be generated. Upon receiving this event, the event task does nothing. Upon receiving this event, the event task will initialize the LwIP network interface netif. The application event callback generally does not need to do anything.

Then, the Wi-Fi driver is ready for sending and receiving data. This moment is good for beginning the application work, provided that the application does not depend on LwIP, namely the IP address.

esp32 dhcp hostname

However, if the application is LwIP-based, then you need to wait until the got ip event comes in. When the Wi-Fi connection is disrupted because of specific reasons, e. For socket-based applications, the application callback can choose to close all sockets and re-create them, if necessary, upon receiving this event. Another thing deserves our attention is that the default behavior of LwIP is to abort all TCP socket connections on receiving the disconnect.

Most of time it is not a problem.


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