Using two UARTS setup for HL78xx, where one UART is used AT commands and a second for PPP traffic

[jyijyi]

can your module change the switracemode to RnD like this?

HL7812 USB failure

I don’t see such problem and I can use USB AT port to do AT communication afterwards: ati3 HL7812.5.7.3.0 OK at+kusbcomp? +KUSBCOMP: 0,0,0,0 OK at+switracemode? +SWITRACEMODE: RnD,9,2,0 OK AT+KUSBCOMP=1,1,2,3 OK at+cfun=1,1 OK I would suggest to enable RnD port in UART0 with AT+SWITRACEMODE command so that you can still enter AT command via UART0 port throughout your testing e.g. at!unlock="A710" OK at+switracemode? +SWITRACEMODE: RnD,9,2,0 OK at+switracemode=RnD OK at+switracemode?…