Start scanning after receiving micro-ESB package

[ilockit_CFR]

Hi,

I'm working on a project which uses two nRF51822 (SD130 and SDK v11.0) on mobile devices. Device A is continously advertising and device B scans for a fixed interval after a disconnect in order to automatically reconnect to device A. Now, I'm trying to reduce the power consumption of device B. The scanning interval is the part with the biggest power consumption at the moment, so I try to figure out some alternative methods. 

I read about the Timeslot API and Micro-ESB and thought about some sort of BLE wake-up procedure. Would it be possible that device A continously sends a "ping" signal on a specific channel via micro-ESB and device B is just listening on that channel? If device B is near device A and receives the ping, it starts scanning for the advertisment and re-connects to A. 

Would that be possible and could it reduce the power consumption compared to scanning the whole time?

Best regards

[Edvin]

That could be a possible sequence, but it will not reduce the power consumption. Listening to the ESB packet on a specific channel draws just the same amount of current as listening for a BLE packet. The power consumption for the radio's RX mode is the same no matter what you use it for.

Best regards,

Edvin