NRF52832 transfer data from peripheral to central with multilink central (20link)

[ckckckboy]

Hi,All

My case is that we need 20 peripherals connect to multilink central and send data to central,then central device need send data to Pc with Uart.

The current situation is a modified multi-link example that guarantees that it can connect 20 slaves while ensuring that ic can send data to the computer through the serial port(Uart).That's all ok

My problem is that when I connect to 10 or so, the number of uploaded data devices will be reduced to two or even one(before starting reducing device,9 devices can send data normally).That's so strange.

Our Devlopment:Keil5

SDk:nRF5_SDK_14.2.0_17b948a

Every peripheral Data package:(ervery exclamation mark expressing one data package)

[ckckckboy]

I really don't know where there is a problem, sincerely hope everyone's help.

[Vidar Berg]

Hi,

I recommend that you read the section about "Suggested intervals and windows" in the SDS. The problem is likely related to your scan and connection intervals. 

[Vidar Berg]

Hi,

Do the peripherals have LEDs or similar to indicate whether are they are advertising or not? Also, have you tried with a different scanner (a smartphone for instance) to see if you discover the same number of devices?

[ckckckboy]

Hi,Vidar

There are no LEDS with our peripherals,but if we poweroff multilink-central ,we can discover the same numbers of devices by smartphone with NRFconnect tools.

[Vidar Berg]

Sounds like some of the peripherals stop advertising for some reason. Do they show up again if you reset them (power-cycle or reset pin)?

[ckckckboy]

Yeah,when we restart peripherals ,we can get all numbers of peripherals in central service,but when we restart central service ,it just  has only 3 or 1 peripherals keeping reporting data to PC (serial port assistant).

[Vidar Berg]

Ok, so some peripherals only start advertising after a reset. Is it possible to attach a debugger to one of these peripherals and confirm if the app receives the disconnect event or if enters a fault exception, etc?