Sim7020
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| Project Sim7020 | |
|---|---|
| |
| SIM7020 NB-IOT modem | |
| Status | In progress |
| Contact | bertrik |
| Last Update | 2021-01-23 |
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:
| 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:
- Ordered a SIM7020 and a starter kit, see https://www.hackster.io/voske65/arduino-nb-iot-with-sim7020-and-t-mobile-027f8f
- Account page: https://portal.iot.t-mobile.nl/auth/login