added changesn back

.gitignore

@@ -105,3 +105,5 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+ffwupd.py

py9b/command/mfg.py

@@ -0,0 +1,24 @@
+"""Manufacturer commands"""
+
+from struct import pack, unpack
+from .base import BaseCommand, InvalidResponse
+
+
+class AuthError(Exception):
+	pass
+
+
+class WriteSN(BaseCommand):
+	def __init__(self, dev, sn, auth):
+		super(WriteSN, self).__init__(dst=dev, cmd=0x18, arg=0x10, data=pack("<14sL", sn, auth), has_response=True)
+		self.dev = dev
+
+	def handle_response(self, response):
+		if len(response.data)!=0:
+			raise InvalidResponse("WriteSN {0:X}".format(self.dev))
+		if response.arg!=1:
+			raise AuthError("WriteSN {0:X}".format(self.dev))
+		return True
+
+
+__all__=["AuthError", "WriteSN"]

wr_esc_sn.py

@@ -0,0 +1,88 @@
+#!python2-32
+from __future__ import print_function
+from sys import exit
+from py9b.link.base import LinkOpenException, LinkTimeoutException
+from py9b.link.tcp import TCPLink
+from py9b.link.ble import BLELink
+from py9b.link.serial import SerialLink
+from py9b.transport.base import BaseTransport as BT
+from py9b.transport.packet import BasePacket as PKT
+from py9b.transport.xiaomi import XiaomiTransport
+from py9b.transport.ninebot import NinebotTransport
+from py9b.command.regio import ReadRegs, WriteRegs
+from py9b.command.mfg import WriteSN
+from time import sleep
+
+
+#new_sn = "16133/00101234"
+#new_sn = "N2GTR1826C1234"
+
+def CalcSnAuth(oldsn, newsn, uid3):
+	s = 0
+	for i in xrange(0x0E):
+		s += ord(oldsn[i])
+		s *= ord(newsn[i])
+	s += uid3+(uid3<<4)
+	s &= 0xFFFFFFFF		
+	if (s & 0x80000000)!=0:
+		s = 0x100000000-s
+
+	return s % 1000000
+
+
+#link = SerialLink(dump=True)
+#link = TCPLink()
+link = BLELink(dump=True)
+
+with link:
+	print("Scanning...")
+	ports = link.scan()
+	print(ports)
+
+	#tran = XiaomiTransport(link)
+	tran = NinebotTransport(link)
+
+	#link.open(("192.168.1.45", 6000))
+	link.open(ports[0][1])
+	print("Connected")
+
+	print("Pinging...")
+	for retry in xrange(20):
+		print(".", end="")
+		try:
+			old_sn = tran.execute(ReadRegs(BT.ESC, 0x10, "14s"))[0]
+		except LinkTimeoutException:
+			continue
+		break
+	else:
+		exit("Timed out !")
+	print("")
+
+	
+	#lock
+	#tran.execute(WriteRegs(BT.ESC, 0x70, "<H", 0x01))
+
+	old_sn = tran.execute(ReadRegs(BT.ESC, 0x10, "14s"))[0]
+	print("Old S/N:", old_sn)
+
+	uid3 = tran.execute(ReadRegs(BT.ESC, 0xDE, "<L"))[0]
+	print("UID3: %08X" % (uid3))
+
+	auth = CalcSnAuth(old_sn, new_sn, uid3)
+	#auth = 0
+	print("Auth: %08X"  % (auth))
+
+	try:
+		tran.execute(WriteSN(BT.ESC, new_sn, auth))
+		print("OK")
+	except LinkTimeoutException:
+		print("Timeout !")
+
+	# save config and restart
+	tran.execute(WriteRegs(BT.ESC, 0x78, "<H", 0x01))
+	sleep(3)
+
+	old_sn = tran.execute(ReadRegs(BT.ESC, 0x10, "14s"))[0]
+	print("Current S/N:", old_sn)
+
+	link.close()