canbus_ids: Use 4 as the first nodeid to reduce id bitstuffing

Starting with nodeid 4 instead of nodeid 0 can reduce bitstuffing of
the id field in common configurations.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/canbus_ids.py

@@ -4,6 +4,8 @@
 #
 # This file may be distributed under the terms of the GNU GPLv3 license.
 
+NODEID_FIRST = 4
+
 class PrinterCANBus:
     def __init__(self, config):
         self.printer = config.get_printer()
@@ -11,7 +13,7 @@ class PrinterCANBus:
     def add_uuid(self, config, canbus_uuid, canbus_iface):
         if canbus_uuid in self.ids:
             raise config.error("Duplicate canbus_uuid")
-        new_id = len(self.ids)
+        new_id = len(self.ids) + NODEID_FIRST
         self.ids[canbus_uuid] = new_id
         return new_id
     def get_nodeid(self, canbus_uuid):