I am using Keil’s PPP client on an STM32F437 MCU with the HL7692 module. I am using the UART interface at 115200 baud and start a PPP session via ATDT99**1#”
It generally works OK but I am only getting a transfer rate of around 60000-70000bps with a good 4G signal. I am not sure where the bottleneck is. I am running at 115200 baud (8N1) so I would expect the bottleneck to be around 115200bps. If I increase the baud rate to 230400 (on a special SW test build that does not crash at this speed) then it makes no difference to the transfer rate.
I am not sure whether this is a limitation on the Keil side, or the HL7692 side.
Are there any known issues with PPP performance on the UART interface?