Reverse direction: send message from slave

[angel]

Hello Nordic,

I have a question: how do I send a message from a slave to a master? I want to do the same as sd_ant_acknowledge_message_tx, starting the communication from the slave. Right now I am trying with that same function but I get an error (0x4015).

Thanks for the help!

[Artucas]

Could you elaborate a little more what you really want to do? Do you know that you can put any data in advertisement packet and master will receive it when scanning for devices? Or do you want to do that in a connection?

[angel]

I want to periodically send packages from slave to master, and somehow make sure that they have arrived. What I thought of so far is, I start the communication with the master, with sd_ant_acknowledge_tx, and then, when I receive this in the slave (EVENT_RX in slave), I do sd_ant_broadcast_message_tx in slave, and manage it in EVENT_TX in master. Is this the only way of doing what I intend?

I had no idea of the existence of such advertisement that you mention. Could you explain a bit more?

Thanks!

Best,

Angel.

[Artucas]

You can simply broadcast your packets by allowing your device to periodically transmit data packets in the air (Beacon type). However, in that case, you can only be sure that you will achieve a packet if your central is in range, but that does not give any strict timing. It might take some time for a central to find those packets. I believe the only way to make sure that your packets arrive is to do it via connection. When you connect to your peripheral, you could just enable characteristic notification and periodically send a notification to the central. That way you are guaranteed to get the message.

[Artucas]

Oh my bad, i didn't read your full message. You are ussing ANT here, rigth? I thought you are asking for bluetooth LE. I haven't done anything with ANT, so really can't help. You will have to wait for another answers.

[angel]

OK Artucas!, thanks anyhow for the help!