What it is
LTE-M (also called LTE Cat-M1) and NB-IoT (Narrowband IoT) are cellular standards from 3GPP made for small, low-power devices rather than phones. Both run on existing 4G LTE networks and carry forward into 5G as its low-power IoT options. A modem module, often sold on a shield or HAT for a Raspberry Pi or microcontroller, takes a SIM and gives the device a data connection wherever the carrier supports the technology.
They trade speed for battery life and reach. LTE-M offers more bandwidth and lower latency, supports moving devices with handover between towers, and can carry voice. NB-IoT uses an even narrower channel, suits devices that stay put and send tiny messages, and penetrates buildings well. Power saving modes let a device sleep most of the time. Carrier support for each varies by country and network.
How I use it
- I use cellular shields and modems so my devices report from anywhere, not just where there is Wi-Fi.
- Paired with a Raspberry Pi and sensors, they carry power-on, usage and location readings from large machinery.
- In the pattern I build with, the modem's data link carries MQTT messages into AWS IoT Core, where they are tracked, stored and read.
A cellular modem is the right tool when equipment is out on job sites, in yards or on the road, where there is no Wi-Fi to join. I use cellular shields and modems so a device reports from anywhere the network reaches. LTE-M suits things that move, like rented machines, while NB-IoT suits fixed sensors that send small readings rarely.
Questions
How do you track equipment where there is no Wi-Fi?
I add a cellular shield or modem to the device so it reports over the mobile network. Paired with a Raspberry Pi and sensors, it can send location and usage readings from a job site or yard.
LTE-M or NB-IoT for asset tracking?
LTE-M usually fits equipment that moves, because it supports handover between towers and has more bandwidth. NB-IoT fits fixed sensors sending small, infrequent readings. Check which one your carrier supports in the area first.