Problem in sending negative values in the payload

[arjanvanb (Arjan)]

Also, the following still does not guarantee that the value will be decoded correctly. In fact, negatives values will erroneously decode into very large positive values if the decoder does not support negative values.

@bialy

More complex solution is present in your example:

int16_t payloadTemp = …;
byte tempLow = lowByte(payloadTemp);
byte tempHigh = highByte(payloadTemp);
// place the bytes into the payload
payload[0] = tempLow;
payload[1] = tempHigh;