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Don’t forget trying to guess if the RX label is the line they transmit out of or you transmit to.
Which is why for a lot of serial protocols nowadays they changed the labeling to MOSI/MISO instead of TX/RX
Isn’t it supposed to be from your device’s perspective?
An RX on your side would be TX on the other.
Set the baudrate to 115200, that way I should get enough garbage to be able to figure out how far off the baud rate is and if flow control is broken!