https://github.com/espressif/esp-idf/issues/1592 That's it! Using lwip_close() instead close() does not close the socket. Thank you so much! There is another function lwip_close_r(). This function also closed the socket correctly. I wonder what is the difference between close(), lwip_close_r() and ...

@kolban: Thank you for this advice. With errno i get the following error: 23 Too many open files in system It looks like there are too many sockets open. Using make menuconfig I increased the maximum number of open sockets from 4 to 5. Now it was possible to accept one client more before the error o...

Hello, I have some problems with the LWIP Socket API for ESP32. With the function accept() I am waiting for a tcp client to connect to the ESP32 as tcp server. Then I can receive data from the client via recv(). This works as expected. Now I want to disconnect the client from the server and accept t...

Hello, I tried to read and write an external memory chip via SPI. But I have some problems with the esp idf library. If I just write or read everything works without problems. But if I write and read the data is not read correctly into the receive buffer. In my program I first write 12 bytes and the...

Hello,

i heard the esp32 supports nested interrupts. If so, how can it be activated?

Hello, i have an external library as an .a file that i want to include into my eclipse project. I followed this guide to use esp-idf with eclipse: https://esp-idf.readthedocs.io/en/v2.0/eclipse-setup.html My project structure look like this: http://fs1.directupload.net/images/user/180222/temp/qw5a5w...

That's already solved my question. Thanks for your reply!

Hello, i use esp-idf to write and read data over the I2C bus. To send or read data I have to call the function below: esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle, TickType_t ticks_to_wait) Can someone explain the meaning of the parameter "ticks_to_wait"? As far as ...

I am thinking about implementing my own preemptive scheduler for ESP32. I'm sure I can only program a context switch in assembler. Since I don't want to deal with assembler for ESP32, but I had the idea to reuse some functions from FreeRTOS. I looked at the libraries and found these two functions in...