Sim7020

From RevSpace
Revision as of 13:55, 24 January 2021 by Bertrik Sikken (talk | contribs) (References)
Jump to navigation Jump to search
Project Sim7020
Sim7020.png
SIM7020 NB-IOT modem
Status In progress
Contact bertrik
Last Update 2021-01-24

What

This page is about the SIM7020 NB-IOT module.

I plan to experiment with this kind of network connectivity for perhaps a bat activity monitor or air quality monitoring.

Update: this escalated quickly ... the NB-IOT stuff at t-mobile already seems dead: Chromium complained about an expired certificate for the https website, otherwise seems down (error 503).

wget says:

bertrik@zenbook:~$ wget http://portal.iot.t-mobile.nl/
--2021-01-23 19:01:06--  http://portal.iot.t-mobile.nl/
Resolving portal.iot.t-mobile.nl (portal.iot.t-mobile.nl)... 52.57.78.255
Connecting to portal.iot.t-mobile.nl (portal.iot.t-mobile.nl)|52.57.78.255|:80... connected.
HTTP request sent, awaiting response... 503 Service Unavailable: Back-end server is at capacity
2021-01-23 19:01:06 ERROR 503: Service Unavailable: Back-end server is at capacity.

bertrik@zenbook:~$ wget https://portal.iot.t-mobile.nl/
--2021-01-23 19:02:35--  https://portal.iot.t-mobile.nl/
Resolving portal.iot.t-mobile.nl (portal.iot.t-mobile.nl)... 52.57.78.255
Connecting to portal.iot.t-mobile.nl (portal.iot.t-mobile.nl)|52.57.78.255|:443... connected.
ERROR: The certificate of ‘portal.iot.t-mobile.nl’ is not trusted.
ERROR: The certificate of ‘portal.iot.t-mobile.nl’ has expired.
The certificate has expired

Hardware

I wired it up like this:

Connections
SIM7020 USB serial Remark
G nc looped to SIM7020-K
R TXD
T RXD
K nc looped to SIM7020-G
V 3V3
G GND
S DTR

References

I followed roughly this guide: