central device, write characteristics

RE: central device, write characteristics

Edvin — Thu, 18 Jan 2024 14:17:44 GMT

Sorry, I must have had a typo when searching for cgms.

In the ble_app_cgms' main.c line 662-663, you can see that the peripheral requires SEC_JUST_WORKS in order to interact with the bms service. You can also see that this is being used in the ctrlpt_char_add() in nrf_ble_bms.c, line 81:

    add_char_params.write_access     = p_bms_init->bms_ctrlpt_sec_req;

Similarly SEC_JUST_WORKS is required in glucose_feature_char_add(), status_char_add() and srt_char_add() in nrf_ble_cgms.c.

So yes, it looks correct. And you probably need to enable indications or indications in order for the peripheral to be able to push data to the central.

Best regards,

Edvin

RE: central device, write characteristics

John Lee — Thu, 18 Jan 2024 01:22:47 GMT

cgms is a nordic sample.
It is in the path below.
\examples\ble_peripheral\experimental\ble_app_cgms
Looking at this sample, the service has a socp characteristic, and measurement begins only when 0x1A is written to socp.
I wrote ble_cgms_c_start_session() for this.

There has been progress.
To write to socp
1. I had to subscribe to indicate
2. The two devices had to be bonded.
Did I understand this correctly?

Now I can successfully get the measurement values updated.

RE: central device, write characteristics

Edvin — Wed, 17 Jan 2024 08:18:32 GMT

Hello,

What is the cgms sample?

I see that you have written a function called ble_cgms_c_start_session(). Where do you use it? What do you expect to happen, and what do you see when you attempt to do so? Please note that you didn't include your main.c file, so I only have your ble_cgms_c.c/h files, and I am not sure what the SOCP characteristic, nor the cgms sample is.

Best regards,

Edvin