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feature: In EvseMode, use random NID and more random NMK, to be able to have multiple EVSEs coexisting without modem resets

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uhi22 2024-07-13 22:23:18 +02:00
parent b2d6ec0928
commit 56a4c909e0
1 changed files with 9 additions and 1 deletions
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10
pyPlcHomeplug.py
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@ -266,6 +266,7 @@ class pyPlcHomeplug():
# Network ID to be associated with the key distributed herein.
# The 54 LSBs of this field contain the NID (refer to Section 3.4.3.1). The
# two MSBs shall be set to 0b00.
self.addToTrace("NID is " + prettyHexMessage(self.NID))
self.mytransmitbuffer[40]=0x01 # 21 peks (payload encryption key select) Table 11-83. 01 is NMK. We had 02 here, why???
# with 0x0F we could choose "no key, payload is sent in the clear"
self.setNmkAt(41)
@ -849,8 +850,11 @@ class pyPlcHomeplug():
# Fill some of the bytes of the NMK with random numbers. The others stay at 0x77 for easy visibility.
self.NMK_EVSE_random[2] = int(random()*255)
self.NMK_EVSE_random[3] = int(random()*255)
self.NMK_EVSE_random[4] = int(random()*255)
self.NMK_EVSE_random[5] = int(random()*255)
self.NMK_EVSE_random[6] = int(random()*255)
self.composeSetKey(0)
self.addToTrace("transmitting SET_KEY.REQ, to configure the EVSE modem with random NMK")
self.addToTrace("transmitting SET_KEY.REQ, to configure the EVSE modem with random NMK " +prettyHexMessage(self.NMK_EVSE_random))
self.transmit(self.mytransmitbuffer)
self.evseSlacHandlerState = 1 # setkey was done
return
@ -1209,6 +1213,10 @@ class pyPlcHomeplug():
self.NMK = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 ] # a default network key. Will be overwritten later.
self.NMK_EVSE_random = [ 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77 ] # In EvseMode, we use this key.
self.NID = [ 1, 2, 3, 4, 5, 6, 7 ] # a default network ID
self.NID[2] = int(random()*255) # in case we are EVSE, prepare a random network ID, to
self.NID[3] = int(random()*255) # allow multiple EVSEs live together without causing modem resets
self.NID[4] = int(random()*255)
self.NID[5] = int(random()*255)
self.pevMac = [0xDC, 0x0E, 0xA1, 0x11, 0x67, 0x08 ] # a default pev MAC. Will be overwritten later.
self.evseMac = [0x55, 0x56, 0x57, 0xAA, 0xAA, 0xAA ] # a default evse MAC. Will be overwritten later.
# a default pev RunId. Will be overwritten later, if we are evse. If we are the pev, we are free to choose a