in arduino/plant_reference.ino [146:155]
void expresslinkExecuteCommand(char *command)
{
Serial.printf(command);
expresslink_serial.printf(command);
expresslink_serial.setTimeout(timeout_ms);
String response = expresslink_serial.readStringUntil('\n');
int responseLen = response.length() + 1;
response.toCharArray(expresslinkResponse, responseLen);
Serial.printf(expresslinkResponse);
}