ESPnow not compiling under esp-idf-master (with possible fix) (IDFGH-15611) (IEP-1664)

[CanHobby]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

v6.0-dev-774-g68b583f30c

Operating System used.

Linux

How did you build your project?

Eclipse IDE

If you are using Windows, please specify command line type.

None

What is the expected behavior?

Example should compile with no ERRORs

Using the Espressif-IDE ver 3.4.0 trying to compile the wifi->espnow example many errors (25) result.

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I may have found the problem.
I needed to edit the "...components/esp_wifi/include/esp_now.h" file..
specifically I added a line 84 to complete the typedef

0084 } esp_now_peer_num_t;

It then compiled fine -- I did need to give the task more stack to remove run-time errors on the ESP32-S3 which is common to most of the ESP examples.

I am using Linux Mint and trying to compile for the ESP32-S3

I have used many other example under the IDE with no problems..

What is the actual behavior?

Should compile with no errors
I think I have found the problem.. see above....

Steps to reproduce.

1. Step
2. Step
3. Step
   ...

Build or installation Logs.

Diagnostic report archive.

No response

More Information.

No response

[github-actions]

Hi @CanHobby! This is an automated response.
If you don’t find the answer helpful, please check the ESP32 IDE forum (https://www.esp32.com/viewforum.php?f=40) or GitHub issues (https://github.com/espressif/idf-eclipse-plugin/issues) to see if the issue has already been discussed.

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Thanks for the detailed report and for sharing your workaround.

Based on the ESP-NOW API documentation, esp_now_peer_num_t is indeed defined as a typedef to the esp_now_peer_num struct in the common esp_now.h header for all supported chips, including ESP32 and ESP32-S3.[ESP32 type defs; ESP32-S3 type defs]

In your case, the missing line:

} esp_now_peer_num_t;

indicates that the esp_now.h file in your Espressif-IDE installation is likely incomplete or corrupted, since the official IDF headers already contain this typedef.

To resolve this in Espressif-IDE (idf-eclipse-plugin):

1. Do not manually modify IDF component headers in the IDE-managed copy, as this can cause inconsistencies later.
2. In Espressif-IDE, reconfigure or reinstall the ESP-IDF environment (via the built‑in ESP-IDF Tools / Setup wizard) so that it downloads a clean, matching ESP-IDF version.
3. After reinstalling, confirm that components/esp_wifi/include/esp_now.h contains the full esp_now_peer_num_t typedef as shown in the documentation.[ESP32 header]

If, after a clean ESP-IDF setup inside Espressif-IDE, the file is still truncated, this points to an IDE packaging issue and should be reported along with your ESP-IDF and Espressif-IDE versions so it can be fixed in the bundled IDF.