[Solved] Need help receiving downlinks in Serial Data Mode

[Anthony Nguyen]

EDIT: I just found out Senet’s console takes in hex for downlinks, and that SD is working perfectly.

Original: I currently have a mDot set to Class C in Serial Data Mode, and it’s connected to a gateway set up with Senet’s packet forwarder. It seems to be sending and receiving packets just fine; after sending 4 downlinks from the Senet console, AT+DLC returns 4. The Senet console also shows that the downlinks were confirmed, and AT+RECV shows the last payload.

What I am having trouble with is receiving the payloads in real-time in Serial Data Mode, as explained in the documentation and shown in this video (timestamped). I put it into serial data mode with AT+SD, and it responds with CONNECT. I can send data by typing characters through picocom, but nothing ever shows up if I try to send a downlink. Is there anything else I need to set to get it to show up?

Thanks

[Jason Reiss]

CommandTerminal.cpp shows the code for a received packet. It should write to the serial port when in serial data mode and a packet is received with port != 0.
You should also see debug output for the number of bytes received for each packet.

void CommandTerminal::RadioEvent::PacketRx(uint8_t port, uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr, lora::DownlinkControl ctrl, uint8_t slot, uint8_t retries, uint32_t address) {
    mDotEvent::PacketRx(port, payload, size, rssi, snr, ctrl, slot, retries, address);

    if (serial_data_mode && port != 0) {
        logDebug("Rx %d bytes", size);
        if (size > 0) {
            CommandTerminal::Serial()->write((char*) RxPayload, RxPayloadSize);
        }
        if (!CommandTerminal::Serial()->readable() && _dot->getAckRequested() && _dot->getClass() == "C") {
            _sendAck = true;
        }
    }
}

[Author]

Posts