Fix JKBMS not starting if BMS manuf. date is empty

CHANGELOG.md

@@ -31,6 +31,7 @@
 * Changed: Improved battery voltage handling in linear absorption mode by @ogurevich
 * Changed: Improved driver disable script by @md-manuel
 * Changed: Improved driver reinstall when multiple Bluetooth BMS are enabled by @mr-manuel
+* Changed: JKBMS - Driver do not start if manufacturer date in BMS is empty https://github.com/Louisvdw/dbus-serialbattery/issues/823 by @mr-manuel
 * Changed: JKBMS_BLE BMS - Improved driver by @seidler2547 & @mr-manuel
 * Changed: LLT/JBD BMS - Fix cycle capacity with https://github.com/Louisvdw/dbus-serialbattery/pull/762 by @idstein
 * Changed: LLT/JBD BMS - Fixed https://github.com/Louisvdw/dbus-serialbattery/issues/730 by @mr-manuel

etc/dbus-serialbattery/bms/jkbms.py

@@ -175,11 +175,14 @@ def read_status_data(self):
  self.custom_field = tmp if tmp != "Input Us" else None
 
  # production date
- offset = cellbyte_count + 164
- tmp = unpack_from(">4s", self.get_data(status_data, b"\xB5", offset, 4))[
- 0
- ].decode()
- self.production = "20" + tmp + "01" if tmp and tmp != "" else None
+ try:
+ offset = cellbyte_count + 164
+ tmp = unpack_from(">4s", self.get_data(status_data, b"\xB5", offset, 4))[
+ 0
+ ].decode()
+ self.production = "20" + tmp + "01" if tmp and tmp != "" else None
+ except UnicodeEncodeError:
+ self.production = None
 
  offset = cellbyte_count + 174
  self.version = unpack_from(