Transmitting data in beacon mode, but am not seeing all data.

RE: Transmitting data in beacon mode, but am not seeing all data.

Susheel Nuguru — Mon, 02 Feb 2026 06:22:56 GMT

glad I could assist in explaining this.

RE: Transmitting data in beacon mode, but am not seeing all data.

Raschke — Sun, 01 Feb 2026 21:45:50 GMT

Hi Susheel,
That makes a lot of sense. Thanks for the help and explanation.

RE: Transmitting data in beacon mode, but am not seeing all data.

Susheel Nuguru — Thu, 29 Jan 2026 07:56:52 GMT

Hi John,

Understood what you need now. Your loop of advertising send is basically flooding the packets, the controller will only transmit what ever last updated adv data it had before it schedules an outgoing packet. During that time your loop can update the advertising data twice and only one could have been sent out as the other one was overwritten before the controller to schedule it out.

Wireshark/scanners could miss advertising packets, And you should not design anything where you assume that scanners cannot miss advertising packets.

I suggest that instead of flooding the adv update, you wait around advertising interval time so that your every update have a maximum chance of being scheduled by the controller to be sent out. Something like this

for (i = 0; i < 10; i++) {
    for (j = 0; j < ARRAY_SIZE(data); j++) {
        adv_mfg_data.Transmit = data[j];
        err = bt_le_adv_update_data(ad, ARRAY_SIZE(ad), sd, ARRAY_SIZE(sd));
        if (err) {
            printk("adv update err %d\n", err);
        }
        k_msleep(50); /* something >= adv interval so it actually gets sent */
    }
}

RE: Transmitting data in beacon mode, but am not seeing all data.

Raschke — Wed, 28 Jan 2026 23:28:09 GMT

Hi Susheel, the main goal is sending the data in the most power efficient manner. The issue I'm finding with the code above; it looks like the advertised data is not updating as I expected to. What I expected to happen is one hex code would be advertised and then updated to the next one until the whole section has been iterated through. When looking on Wireshark, this is not what is being received.

RE: Transmitting data in beacon mode, but am not seeing all data.

Susheel Nuguru — Wed, 28 Jan 2026 09:48:57 GMT

John,

What are you trying to achieve exactly?

"trying to send data most efficiently" and "sending data in groups" does not seems to conflict. What is the exact problem that you are trying to solve? I cannot look into your code with a generalized problem. We need very specific issue that you are trying to solve to invest time into code debugging.