Sorry that AT lib is not open source, and maybe it will not change to open source in the future. Sorry for the inconvenience.
Have you enabled hardware flow control? At 1M baud, the CPU can read out the data in fifo in time. But At 2M baud-rate, the CPU cannot read out the data in fifo in time, resulting in data loss. When enable the flow control, the baud-rate can reach 5M.
That's all right with me if we could get it working without errors in the uart communication.
I'm in the process of setting up HW control.
When compiling IDF and AT with 8,0,1,3, it doesn't seem to change anything at all. It chatters like it's not set after a reset.
When we send the UART_CUR command with HW control, the behavior changes radically.
Are we supposed to change the HW control on the host side after we send the UART_CUR changes to HW control, not from start?
IoT hacking all night long.
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