How to make server mute, but still listening

[matthias]

Hi, we are currently using the nrf51822 for sensor communication. Is there a possibility to make it airplane ready? Which means, no rf emmision for the ble for some unknown time. My idea is to set the part over the air into server / observer mode, where it should be truely listening for 50ms every 1s, with no emission at all. Only when it receives a certain advertisement package with a specific code, it turns back into slave mode and starts advertising again. The question: can I receive advertisements without any rf emmision?

[Petter Myhre]

You can use SoftDevice S120, which can be central or peripheral, or S130, which can be central and peripheral, for this.

You start out as a central/observer, and you scan for advertising packets. You have two types of scanning, active and passive. You want to use passive scanning, because then you don't send out any scan requests, so the radio will never transmit anything.