I am trying to use hardware flow control on HL6528G-2.8V FW version 8.10 (same issue on FW V3.0 and HL6528RD with latest firmware)
When I activate AT&K3 (use hardware flow control)
RTS line controls modem just fine when I receive large data but when I send large data (>1500bytes) by AT+KUDPSEND command CTS never signals to stop sending (goes to electrical 2.8V) just stays at 0volts all the time, actually it never changes state after normal power up sequence when it goes from electrical 2.8V to 0V.
I checked this with multiple modules and multiple boards including Sierra Wireless development board and also new HL6528RD module with latest FW
Is there known issue with CTS line on HL6528 series or am I using it wrong
Can you write short description when CTS line will control on incoming large amount of data?