Packet type recognition without the need for decryption?

Development
1

Hi am looking to add a buzzer to my board to bleep when an incoming message is received. Is it possible to distinguish between packet types of i.e Becon packets, location packets and the one i want to distinguish is the msg packet for the phone user.
Also long term a way to send none encrypted style packet that can send a status byte that the esp32 can use to send and receive input output status of pins
My basic code below edited into PhoneAPI.cpp i fear will bleep on all types of received packets.

/**

  • Handle a packet that the phone wants us to send. It is our responsibility to free the packet to the pool

*/

void PhoneAPI::handleToRadioPacket(MeshPacket *p) {}

extern bool BleepOnOff;

/// If the mesh service tells us fromNum has changed, tell the phone

int PhoneAPI::onNotify(uint32_t newValue)

{

checkConnectionTimeout(); // a handy place to check if we've heard from the phone (since the BLE version doesn't call this

                          // from idle)

if (state == STATE_SEND_PACKETS || state == STATE_LEGACY) {

   BleepOnOff=(!BleepOnOff);   '// toggle bleeper on and off 

    DEBUG_MSG("Telling client we have new packets %u\n", newValue);

    onNowHasData(newValue);

    DEBUG_MSG("BEEP  %u%u\n", BleepOnOff, newValue); // debug message to simulate my attached sounder

    if (BleepOnOff== true) delay(5000); // delay for on time of bleeper.. is there a smart delay to use to allow other processes 

} else

    DEBUG_MSG("(Client not yet interested in packets)\n");

return 0;

}

1 Like
2

All of the ‘packet type’ info inside the portion that is encrypted.

Though by the time onNotify is called the packet has already been decrypted.

3

Ah yes should have guessed that considering my TTGO displays the msg on OLED even though the phone is not connected to it.
Now found the location where i can best look at the decoded msg and do my debug beep msg received thing in NodeDB.cpp. Not found it yet , but this also means there will be a place to inject a msg string for PIN IO such as a string '#GPIO03=1" to be decoded at the the other end as GPIO03 has changed state to High and dealt with accordingly.

case SubPacket_data_tag: {

        // Keep a copy of the most recent text message.

        if (p.data.typ == Data_Type_CLEAR_TEXT) {

            DEBUG_MSG("Received text msg from=0x%0x, id=%d, msg=%.*s\n", mp.from, mp.id, p.data.payload.size,

                      p.data.payload.bytes);

            if (mp.to == NODENUM_BROADCAST || mp.to == nodeDB.getNodeNum()) {

                // We only store/display messages destined for us.

                devicestate.rx_text_message = mp;

                devicestate.has_rx_text_message = true;

                updateTextMessage = true;

                powerFSM.trigger(EVENT_RECEIVED_TEXT_MSG);

                notifyObservers(true); // Force an update whether or not our node counts have changed

                DEBUG_MSG("BEEP ON\n"); // my beep on thing

                delay(700);

                DEBUG_MSG("BEEP OFF\n"); // my Beep thing

                delay (200);

            }

        }