live_telnet_data_plot: fix overwriting datafile

diff --git a/esp32/EthernetUART/LANTelnetToI2C_Board/live_telnet_data_plot.py b/esp32/EthernetUART/LANTelnetToI2C_Board/live_telnet_data_plot.py
index af56229b2fb9d6ca01db642646f197e993a5d383..6b7802def1c2703640693771d8244211b09007aa 100644 (file)
--- a/esp32/EthernetUART/LANTelnetToI2C_Board/live_telnet_data_plot.py
+++ b/esp32/EthernetUART/LANTelnetToI2C_Board/live_telnet_data_plot.py
@@ -102,7 +102,7 @@ def get_data():
             file.write('\n' + timestamp.strftime('%Y-%m-%d %H:%M:%S.%f') + '\n' + str(reader))            
 #            file.write(file_history + '\n' + timestamp + '\n' + ch0 + '\n' + ch1 + '\n' + ch2 + '\n' + ch3 + '\n')
     except:
-        with open(filename, "w") as file:
+        with open(filename, "a") as file:
             file.write(timestamp.strftime('%Y-%m-%d %H:%M:%S.%f') + '\n' + str(reader))
 #            file.write(timestamp + '\n' + ch0 + '\n' + ch1 + '\n' + ch2 + '\n' + ch3 + '\n')
             file.close()