ST87M01

JuanMarGo · ‎2025-03-21

I'm trying to develop a multiprotocol board with Dual Stack wM-Bus + NB-IOT. I found this link:

https://www.st.com/en/wireless-connectivity/nb-iot-products.html

So the ST87M01 module is capable of it.

I have the next questions:

1) The module is sold with the firmware (dual stack) flashed ?

2) The module need extra hardware? It is a noise filter or something, or it just need a STM32L5 as a host?

3) Where can I find documentation about how to control the ST87M01 module from the host? An AT command list or something.

Thanks!

Peter BENSCH · ‎2025-03-21

~~Correct, there is no dual stack built-in.~~

As I found out after talking to the marketing department, my previous answer was wrong: there is indeed a wM-Bus stack in parallel to the NB-IoT stack, but it is only available as a fallback solution (e.g. if the NB-IoT connection fails in the basement of a building). Details can be found in the press release from @GianlucaT above.

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

View solution in original post

Andrew Neil · ‎2025-03-21

Have you checked

https://www.st.com/en/wireless-connectivity/st87m01.html#documentation

https://www.st.com/en/wireless-connectivity/st87m01.html#tools-software

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

JuanMarGo · ‎2025-03-21

I read every document and didn't find nothing about question 1) and 2).

About the 3) question Section 1.2 "Reference documents" on page 2 of the manual lists "ST87MXX_UM_AT commands description" as document number (2). This indicates that a separate document exists which describes the AT commands for the ST87M01 module family, BUT I can't find it.

Peter BENSCH · ‎2025-03-21

@JuanMarGo On the overview page it is expressed somewhat ambiguously: ‘suitable for multi-protocol such as wM-Bus as fallback solution’ means that it can be used INSTEAD of wM-Bus if necessary. It therefore does not contain a wM-Bus stack. [wrong statement, see the accepted answer]

Otherwise, all public information can be found on the product's website. For more detailed and additional documents, please contact your local distributor or the local office of STMicroelectronics.

Hope that helps?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Andrew Neil · ‎2025-03-21

@Peter BENSCH wrote:
On the overview page it is expressed somewhat ambiguously

Hmmm ... yes it is:

I think that's rather misleading.

I guess what they meant was, "can be used in conjunction with an wM-Bus device to provide an NB-IoT fallback" ?

Any chance to get this corrected?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

JuanMarGo · ‎2025-03-21

Resuming, the chip has not dual stack inside.

Peter BENSCH · ‎2025-03-21

~~Correct, there is no dual stack built-in.~~

As I found out after talking to the marketing department, my previous answer was wrong: there is indeed a wM-Bus stack in parallel to the NB-IoT stack, but it is only available as a fallback solution (e.g. if the NB-IoT connection fails in the basement of a building). Details can be found in the press release from @GianlucaT above.

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Peter BENSCH · ‎2025-03-21

@Andrew Neil Of course, there is always a chance. Let's see how quickly the web team responds.

@Lina_DABASINSKAITE Could you please pass on Andrew's suggestion?

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Lina_DABASINSKAITE · ‎2025-03-24

Hi there,

Thanks for brining this up, @Andrew Neil and @Peter BENSCH . I shared with a responsible team for a review.

Regards,

Lina

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

GianlucaT · ‎2025-04-07

Hi Andrew,

The ST87M01, as announced through this PR (https://newsroom.st.com/media-center/press-item.html/n4651.html), is a NB-IoT module which gives the customer the chance to use - in the same module - the wM-Bus firmware as fallback option (not as priority). Everything is in the same module, as highlighted in the above sentence.