corrected sample get commands

extended documentation of data_stream commands
corrected/extended documentation of start_factory_bootloader commands

added set_data_stream-function in serial interface
added data_cursor_rewind action-function in serial interface
added start_factory_bootloader action-function in serial interface

dataloggerui/commands.py

@@ -153,11 +153,11 @@ See :ref:`sample_count <sample-count>`.
 
 RTC_Date(yyyy.mm.dd hh:mm:ss.fff);
   <*Measurement_Auto*>;Battery_Voltage(V);
-  BME_Temperature(C);BME_Pressure(Pa);BME_Humidity(%);ADC_IN8(V);ADC_IN9(V)
+  BME_Temperature(C);BME_Pressure(Pa);BME_Humidity(%);ADC_IN8(V);ADC_IN9(V);ADC_IN10(V);ADC_IN11(V)
 
 <*Measurement_Auto*>: {'0': manual measurement, '1': RTC time based measurement}           
 
-example: '2021.02.24;15:39:38.183;0;0.602;27.477;97851.906;60.512;3.485;0.000'
+example: '2021.03.22 09:16:22.199;0;7.132812;23.437500;96792.335937;36.806640;3.480591;0.000000;0.000000;0.000000'
 '''),
     rtc_time=Command('RTG',
                      doc='''
@@ -273,6 +273,9 @@ Name cannot be empty
     data_stream=Command('DSS', 'active', 1,
                         doc='''
 activate/deactivate fast data streaming over serial port {'0': disable, '1': enable}
+
+.. note::
+    The streamed data are not stored in the FLASH of the datalogger. They are just sent out once over the virtual COM-Port.
 '''),
     auto_sampling=Command('ASS', 'active', 1,
                         doc='''
@@ -330,15 +333,15 @@ Trigger a manual measurement over the serial interface. The measurement is logge
 with the flag indicating automatic measurement set to 0.
 '''),
     # This will be removed from the serial UI
-    start_factory_bootloader=Command('UBA',
+    start_factory_bootloader=Command('UBA', 'key', 4,
                    doc='''
 .. note::            
     This command does not return ``ACK`` on success
 
-Exit the user application and jumps to the factory integrated USB-Bootloader.
+Exit the user application and jumps to the factory integrated USB-Bootloader (DFU USB Device).
 
 Just a small key is needed to successful enter the bootloader (4 
-characters) {hexadecimal: ``12345678``}.
+characters) {hexadecimal: ``0x78345612``}.
 
 A firmware update can be executed with the STM32CubeProgrammer 
 application (details see in user manual)

dataloggerui/serialui.py

@@ -528,6 +528,38 @@ def set_device_name(name):
     if 'nak' in answer.lower():
         raise RuntimeError(f"Failed to set device name {name}")
 
+def set_data_stream(stream=False):
+    """ Enable/Disable data streaming over serial interface.
+    If enabled, one measurement after another is executed and values are streamed over serial interface.
+    Data-Output is the same as MVG-Command is executed.    
+
+    Parameters
+    ----------
+    stream: :class:`bool`, optional (default False)
+        False to disable the data streaming. True to enable it.
+        If not given, it defaults to False, i.e. the data streaming is disabled.
+
+    Raises
+    ------
+    RuntimeError
+        If command fails: logger returns ``NAK``
+    """
+    
+    cmd = SetterDict['data_stream'](streaming='1' if stream else '0')
+    answer = run_command(cmd).data
+    if 'nak' in answer.lower():
+        raise RuntimeError("Failed to set data stream enable/disable")
+
+
+def enable_data_stream():
+    """ Alias for :func:`~.set_data_stream` with True argument"""
+    set_data_stream(True)
+
+
+def disable_data_stream():
+    """ Alias for :func:`~.set_data_stream` with False argument"""
+    set_data_stream(False)
+
 
 def set_sampling_interval(interval):
     """ Set sampling interval over the serial port
@@ -752,6 +784,33 @@ delete_samples = data_clear
 """ Alias for :func:`~.data_clear`. """
 
 
+def data_cursor_rewind():
+    """ Rewind the data readout cursor, so on next data export all stored data are 
+        exported again, not only the not already exported.
+    
+    Raises
+    ------
+    RuntimeError
+        If command fails: logger returns ``NAK``
+    """
+    answer = run_command(ActionDict['data_cursor_rewind']()).data
+    if 'nak' in answer.lower():
+        raise RuntimeError(f"Failed to rewind data cursors")
+
+
+def start_factory_bootloader():
+    """ Exit the user application and jumps to the factory integrated USB-Bootloader (DFU USB Device).
+    
+    Raises
+    ------
+    RuntimeError
+        If command fails: logger returns ``NAK``
+    """
+    answer = run_command(ActionDict['start_factory_bootloader'](key=bytes.fromhex('78345612').decode('utf-8'))).data
+    if 'nak' in answer.lower():
+        raise RuntimeError(f"Failed to start factory USB DFU bootloader")
+
+
 def get_data_to_pandas(*, from_sample=0, resample=True):
     """ Get series of smaples and return a :class:`pandas.DataFrame`.