Answer: The HAT is compatible with all Raspberry Pi which contains 40W GPIO header.
Answer: Yes, you can use directly USB for AT commands. Drivers are available in the product description.For Ubuntu you won't need to install, it recognizes the device. (/dev/ttyUSB3 115200 can be used)
Answer: Serial can be enabled by following the instructions below:
- Run sudo raspi-config.
- Select Interfacing Options.
- Select Serial.
- Disable Login shell to be accessible over serial.
- Enable Serial port hardware.
- Finish and reboot your Raspberry Pi.
Answer: Yes, Active GNSS/GPS antenna can be used with the shield. In order to use it, you will need to solder it as in the picture below.
Answer: Yes, It supports IPv6. Please check the AT command Guide
Answer: Yes, it's compatible.
Answer: This Shield does not have an audio codec, as a result of which voice dialing is not possible with our Shield.
Answer: PPP is a data layer communication protocol that is established through the serial port of the modem. These Serial port communication could be either the UART(/dev/ttyS0) or the serial exposed to USB(/dev/ttyUSB3). This serial is also used for both modem commands (AT commands) and responses. This connection is established by dial-up (ATD*99#).
PPP is easy to establish, widely used protocol, and flexible with the devices. PPP may show a drop of the connection while using the AT command set for other functionality of modem.
The LTE radio protocol has native support of TCP/IP and IPv6, so there is no need to actually wrap TCP/IP into PPP over the radio interface. The PPP protocol is just used between the computer and the modem to make the connection look like a legacy dial-up modem-based network connection.
To get rid of the legacy cruft, newer ways to present USB-connected LTE modems like QMI and MBIM have been developed.
Quectel modules offer QMI(Qualcomm MSM Interface) which is established as a real network interface, such as ethernet(typically shows as wwan0). The QMI is also counted among the non-AT protocols which are communicated over /dev/cdc-wdm0 port.
In order to establish a connection, proper qmi/gobinet proxy should be installed, which again depends on the chipset of the module/modem and the kernel of Linux, gets a bit complicated. The QMI offers a more accessible and faster connection compared to the PPP protocol.
We recommend QMI, if you are looking for a faster connection, and for a longer duration.
If you need to establish an internet connection for a short period of time and the date to be transferred is not high, you may stick to PPP.