The unit i received has a 12mhz crystal, the unit in the picture and in the docs has an 8mhz crystal. please update docs?

Hi, Thanks for your suggestion, we will update it.

I want to be able to monitor and transmit CAN transmission on my Snapmaker 3D printer with a PI4B. Will this work? Do I need anything else?

If you connect this board to your Pi and connect the board to a properly terminated CAN bus to your printer, you should be able to use the Linux SocketCAN interface to talk to the printer. I looked the Snapmaker and there is some sort of CAN hub you can use to make a connection. Passively monitoring is more tricky - that's best done with a specific tool such as a Kvaser analyzer or a logic analyzer if you pick off the CAN signals after they have been converted from CANH/CANL by a logic transceiver. The CAN board does support direct connection to the CAN network, and there is a lot of sample code on the web on how to bring up SocketCAN with ifConfig on it.

Is there a C/C++ api for this thing? I'm not getting this obsession with using Python.

You use Linux SocketCAN. Once Linux brings up the interface with ifConfig, you can use regular BSD Socket Calls from wherever you like.

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Wireless Type	802.11b
Brand	waveshare
Item model number	WAV_14882
Operating System	Ubuntu
Item Weight	0.634 ounces
Product Dimensions	1.97 x 1.57 x 0.79 inches
Item Dimensions LxWxH	1.97 x 1.57 x 0.79 inches
Color	RS485 CAN HAT for RPI
Manufacturer	Waveshare
ASIN	B07VMB1ZKH
Date First Available	July 23, 2019

RS485 CAN HAT for Raspberry Pi 5/4B/3B+/3B/2B/B+/Zero/Zero W/WH/Zero 2W, CAN Controller MCP2515 SPI Interface Transceiver SIT65HVD230DR Long Distance Communication with RS485/CAN Function

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