Mobile Protocols
Introduction to mobile internet protocols using on the 5G router.
There are three different mobile protocols built in the 5G router. The default mobile protocol is Mobile Data. Suggest using the default protocol unless your mobile provider does not support it.
Mobile Data Protocol
The default Mobile Data protocol supports the below "QMI Cellular" and "PPP" protocols and works under an advanced mmcli command set. It uses QMI Cellular in priority and automatically switches to PPP protocol when QMI is not supported.
In rare cases, the mobile carrier might request to use the original QMI or PPP protocols, and then you can switch the mobile protocol under the settings of the Mobile interface.
QMI Cellular Protocol
QMI, short for Qualcomm MSM Interface, is a proprietary protocol that offers more accessible and faster connections to mobile networks.
Due to the difference in the modem chipsets, the different mobile modems might use other QMI proxies. For example, Sierra modems use the QMI_WWAN proxy, and Quectel modems use the GobiNet proxy. These proxies use the same QMI protocol and provide similar working performance.
The primary difference is that GobiNet uses kernel space, while qmi_wwan uses user space. In qmi_wwan, only one process can handle the control port at a given time, while the GobiNet proxy allows multiple processes to access the device concurrently.
PPP Protocol
PPP, Point-to-Point Protocol, is a traditional data link layer communications protocol. PPP protocol has been widely used and is the most flexible for device interoperability.
Some mobile carriers might not support the QMI protocol to connect to their mobile networks. So, we must change the mobile protocol from the default Mobile Data protocol to the PPP protocol.
Tutorial of switching the mobile protocol https://www.outdoorrouter.com/4g-mobile-interface-protocol-qmi-and-ppp/
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