Due to the integration of esp32 and other radio frequency parts in our product, the esp32 has suffered severe radio frequency interference. I saw that the esp32 document stated that the module has a built-in filter. I now have two problems: 1. Are there any specifications for the filtering character...

由于我们产品中集成了 esp32 和其他的射频部分，导致esp32 受到了严重的射频干扰，我看到 esp32 的文档中有介绍说模组内置有滤波器，我现在有两个问题：
1. 有没有内置滤波器的滤波特性的规格？我们需要评估滤波特性是否满足要求。在官方 datasheet 里面并没有看到有。
2. 如何给模组增加额外的滤波器以提升滤波性能？

主要是想增加接受信号的灵敏度，进而增加WiFi信号的接收距离。

I saw the sig_len contains fcs ,But Does payload contains fcs bytes?

I print the raw packet , I seems the last 4 bytes is not fcs, they are all incorrect .

I think you should check the which brand of usb-serial chifp on the board, and install the right driver.

ESP_Angus wrote:Regarding OTA and protection of data on the server or in transit, let's continue the discussion over here:
https://esp32.com/viewtopic.php?f=2&t=2 ... =10#p19194

Sorry , I have seen your reply there. This solve my problem already, thank you!

As WiFive says, using flash encryption & secure boot together provides local physical firmware security. To protect data in transit over the network, you need additional steps. To prevent OTA updates being downloaded by unauthorised parties, I'd recommend using HTTPS and some kind of authentication...

Hi malaimo, A bootloader without secure boot enabled should boot a signed image without issue, the signature is ignored. (Use flash encryption with secure boot to prevent signed images being run on other hardware.) Hello~~ I got your idea, flash encryption can prevent flash reading, and then preven...

if I signed the app image by the secure boot pem, then will it run ok on an board that secure boot is not enabled? Is the bootloader and the app image verify each other mutally ? or the bootloader just verify app image, and signed app image can run on any other board that secure boot is not enabled?...

No you would need to add another layer of encryption on the bin file and store the shared decryption key on all the devices. Thanks for your response, You give me some inspirations, I think I can do that like this 1. flash a shared decryption key to the devices when I give them out. 2. do decrypt i...