get-payload
wayland/cayenne-lpp/get-payload
Get payload as a string of hex characters.
get-payload
@/get-payload
Get payload as a string of hex characters.
LPP@/lpp
A low power payload.
Sizenumber
Maximum size of payload (number of bytes). Must be a constant value. Any changes during program execution will be ignored.
UPDpulse
Update.
Donepulse
Pulse on completion.
PYLDstring
Encoded payload. String of hex characters.
C++ implementation
#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_UPD
node {
CStringView view;
char* payload;
size_t cap;
void evaluate(Context ctx) {
if (isSettingUp()) {
cap = getValue<input_Size>(ctx) * 2 + 1;
payload = new char[cap];
view = CStringView(payload);
}
if (isInputDirty<input_UPD>(ctx)) {
auto lpp = getValue<input_LPP>(ctx);
uint8_t* buff = lpp->getBuffer();
uint8_t N = lpp->getSize();
memset(payload, '\0', cap);
for (uint8_t i=0;i<N;i++) {
payload[i * 2] = "0123456789ABCDEF"[*(buff+i) / 16];
payload[i * 2 + 1] = "0123456789ABCDEF"[*(buff+i) % 16];
}
emitValue<output_PYLD>(ctx, XString(&view));
emitValue<output_Done>(ctx, 1);
}
}
}