I am trying to bring up a HL7588 chip on OpenWRT QMI. When I bring up the OS I see that ttyACM devices are created, rather than ttyUSB. I am able to successfully connect to ttyACM0 and send AT commands to the chip and get a response. What is not happening is the cdc-wdm0 handle is not created and as a consequence the QMI is not able to communicate with the chip. I have the Sierra Wireless specific drivers loaded, but I must be missing something either in the configuration or the order of the drivers loading.
Is anyone able to give me some guidance in how to proceed?