BLE stack 2.1.1, SNP project: SNP_OUT_OF_RESOURCES error when central is a PC?

Gregory Kovelman

Other Parts Discussed in Thread: CC2640

Hi,

My application is fairly simple: sending 100 notifications from the SAP via the SNP (CC2640) to some central device.
When the central device is an iPhone, the packets are received at a high rate (about 100 packets per second) and no errors.
When the central device is a Linux PC (with BlueZ stack), the packets are received at a much lower rate (around 10-20 packets per second) and I receive a SNP_SEND_NOTIF_IND_CNF packet at the SAP with status of SNP_OUT_OF_RESOURCES error.
Where could the problem come from? How can the resources be depleted?

Best regards,

Gregory

over 10 years ago

0 Tim C over 10 years ago

TI__Mastermind 34660 points

I would guess that the connection interval is slower with the linux device so that you are running out of buffer space in the SAP since packets can't be sent out fast enough. You can verify by comparing sniffer captures of both cases.

0 Gregory Kovelman over 10 years ago in reply to Tim C

Intellectual 390 points

Yeah, looks like it. I'll update when I test it.

I've tried earlier to modify the interval using

SAP_setServiceParam(SNP_GGS_SERV_ID, SNP_GGS_PERI_CONN_PARAM_ATT, ....);

but that was not the correct API call...

0 Gregory Kovelman over 10 years ago in reply to Tim C

Intellectual 390 points

Indeed this was the issue. I called the wrong API.

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BLE stack 2.1.1, SNP project: SNP_OUT_OF_RESOURCES error when central is a PC?