Limited Data Speed Using LTE Clipper HAT on Raspberry Pi Zero 2 W

Support
1

Hi,

I recently connected the LTE Clipper HAT to a Raspberry Pi Zero 2 W, and followed the official guide step by step:

👉 Getting Started with Clipper HAT – Pimoroni Guide

The basic mobile internet connection is working, and I can communicate with the modem via minicom, but the data speeds are severely limited – I’m unable to get above ~100 kbps, both for download and upload.

After some testing, it seems that the connection is limited by the serial communication speed (115200 baud) used in minicom. That makes sense for AT commands, but not for data throughput.

My question is:

How can I achieve the full LTE data speed that the Clipper HAT supports?

Is there a way to configure the modem for higher-speed data transfer (e.g., PPP, QMI, MBIM, or USB tethering) that bypasses the serial baud rate limitation?

Thanks in advance for any suggestions or guidance.

2

Minicom has a -b option to set the baudrate. This does not help if you cannot set the baudrate of the modem-device. Check the AT-reference manual (it is linked from the shop-page), usually you can set the baudrate to something else.

Some devices support different baudrates for data and command mode. Again, this should be covered somewhere in the AT reference manual of the clipper.

3

You wont be able to run it on ttyS0 on higher than 115200.

I had to move it to AMA0 by switching off blueetooth and using AMA0.
Then you can access minicom at 115200, use at command (“AT+IPR=921600”) to go 921600 and save (“AT&W”).
access again on 921600 now and check.
Then edit the conf file for 921600.
It reaches 2.200kB/s now, i think max for this.

But it fought me every step of the way