multi-central limitation

[Avi]

I am using the UART multi-central example (from GITHUB) and connecting multuple peripherlas each streaming data at 38K

The multi-central is gathering the data from the various peripherals.

I noticed that if the data throughput is high, the multucentral device cannot handle it and crashes.

What is the limitation of the multi-central? How much data/ peripherlas can it connect and get data at which rate?

[Susheel Nuguru]

I noticed that if the data throughput is high, the multucentral device cannot handle it and crashes.

I am assuming you are using Softdevice and not Softdevice Controller. It would be nice if you can get the context of what you mean by "crashes"? If it is a system restart, then you can

• compile your application with debug version,
• start the application in the debugger,
• put breakpoints at NVIC_SystemReset() (grep your whole code for NVIC_SystemReset) and 
• run the application in the debugger until you reach the state which you mention as "crashes". 

Hopefully at this point one of the breakpoints at NVIC_SystemReset will be hit and you can post the function call stack here so that we get more context on the cause of the reset. 

[Avi]

I get the following trace when I have only one client connected to the multi-central and streaming data at rate of once every 2 seconds. I don't understand why there is "Connection handle invalid". When I have more clients, there are more warnings like this and eventually, the muli-sentral cannot connect to anyone

<debug> app: Receiving data.
<debug> app: 04 00 00 00 00 00 00 04|........
<debug> app: 0B 04 28 00 00 00 00 2C|..(....,
<debug> app: 0A |.
<warning> ble_nus_c: Connection handle invalid.
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Write Request
<debug> nrf_ble_gq: SD GATT procedure (1) succeeded on connection handle: 1.
<warning> ble_nus_c: Connection handle invalid.
<warning> ble_nus_c: Connection handle invalid.
<warning> ble_nus_c: Connection handle invalid.
<debug> ble_nus_c: Client sending data.
<debug> nrf_ble_gq: Processing the request queue...
<debug> nrf_ble_gq: Processing the request queue...