if (serial_write_blocking(serial, poll_cmd, strlen(poll_cmd),
SERIAL_WRITE_TIMEOUT_MS) < 0) {
sr_err("Unable to send poll request.");
return SR_ERR;
}
if (serial_write_blocking(serial, poll_cmd, strlen(poll_cmd),
SERIAL_WRITE_TIMEOUT_MS) < 0) {
sr_err("Unable to send poll request.");
return SR_ERR;
}