When exporting datas：BrokenPipeError: [Errno 32] Broken pipe #40

[pandabiu]

**Describe the bug
When using the command：idf.py -p /dev/ttyUSB0 monitor | grep "CSI_DATA" > my-experiment-file.csv ,there is a error:BrokenPipeError: [Errno 32] Broken pipe

**Tool Settings

Baud Rate: [1152000] (using a lower baud rate WILL cause issues. this is the most common issue)
WiFi Channel per Device: [ 6]
FreeRTOS > Tick rate (Hz): [1000]

**Steps to reproduce the behavior:

1.use the code of ESP-CSI TOOL ，cd ./active_ap

2.Recording to the README.md use the commond: idf.py menuconfig

3.idf.py -p /dev/ttyUSB0 flash

4.use the commond :idf.py -p /dev/ttyUSB0 monitor ,then let my phone connect to the AP,it can collect CSI successfully.

QQ图片20211112105551.png (60.51 KiB) Viewed 2750 times

5.use the commond:idf.py -p /dev/ttyUSB0 monitor | grep "CSI_DATA" , let my phone connect to the AP, then it printed the error like this :

QQ图片20211112123648.png (106.6 KiB) Viewed 2750 times

6.use the commond:idf.py -p /dev/ttyUSB0 monitor | grep "CSI_DATA" > my-experiment-file.csv , let my phone connect to the AP, then it printed the error like this :

QQ图片20211112105720.png (94.95 KiB) Viewed 2750 times

Desktop (please complete the following information):

OS: [Ubuntu16.04]
ESP-IDF Version: [4.2.1]

[ESP_Sprite]

The monitor is intended to run interactively, that is, without its output redirected. As a workaround, you can use ctrl-L in a monitor session to copy the output to a log-file, then after you're done, grep that log file for your data.