Hi,
I have more than 8 years of experience in embedded design and development. I have worked on many applications for e.g. WiFi, GSM, GPS, BLE, ZigBee etc.
I have already worked on Raspberry Pi with 4G usb dongles as well serial modems. I have developed firmware with direct socket programming and also with qmi protocol. I have interfaced Sierra, quectel and huawei USB modems with RPi2/3.
Let’s talk about your issue and go ahead.
Thanks.