   return SCPI_SUCCESS;
 }
 
-void setup()
-{
-  struct scpi_command* source;
-  struct scpi_command* measure;
-
-  scpi_init(&ctx);
-
-  scpi_register_command(ctx.command_tree, SCPI_CL_SAMELEVEL, "*IDN?", 5, "*IDN?", 5, identify);
-
-  source = scpi_register_command(ctx.command_tree, SCPI_CL_CHILD, "SOURCE", 6, "SOUR", 4, NULL);
-  measure = scpi_register_command(ctx.command_tree, SCPI_CL_CHILD, "MEASURE", 7, "MEAS", 4, NULL);
-
-  scpi_register_command(source, SCPI_CL_CHILD, "VOLTAGE", 7, "VOLT", 4, set_voltage);
-  scpi_register_command(source, SCPI_CL_CHILD, "VOLTAGE1", 8, "VOLT1", 5, set_voltage_2);
-
-  scpi_register_command(measure, SCPI_CL_CHILD, "VOLTAGE?", 8, "VOLT?", 5, get_voltage);
-  scpi_register_command(measure, SCPI_CL_CHILD, "VOLTAGE1?", 9, "VOLT1?", 6, get_voltage_2);
-  scpi_register_command(measure, SCPI_CL_CHILD, "VOLTAGE2?", 9, "VOLT2?", 6, get_voltage_3);
-
-  analogWrite(3, 0);
-
-  Serial.begin(9600);
-}
-
-void loop()
-{
-  char line_buffer[256];
-  unsigned char read_length;
-
-  while(1)
-  {
-    read_length = Serial.readBytesUntil('\n', line_buffer, 256);
-    if(read_length > 0)
-    {
-      scpi_execute_command(&ctx, line_buffer, read_length);
-    }
-  }
-}
-
-
-

  return SCPI_SUCCESS;
}

scpi_error_t get_voltage_2(struct scpi_parser_context* context, struct scpi_token* command)
{
  float voltage;

  return SCPI_SUCCESS;
}

/**
 * Set the voltage using PWM on pin 3.
 */
scpi_error_t set_voltage(struct scpi_parser_context* context, struct scpi_token* command)
{
  struct scpi_token* args;
