Create B6-temp.md

B6-temp.md

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+```
+
+function getBitRange(data, bitIndex, bitWidth)
+	byteIndex = bitIndex >> 3
+	shift = bitIndex - byteIndex * 8
+	value = data[1 + byteIndex]
+	if (shift + bitWidth > 8) then
+		value = value + data[2 + byteIndex] * 256
+	end
+	mask = (1 << bitWidth) - 1
+	return (value >> shift) & mask
+end 
+
+-- sometimes we want to cut a CAN bus and install rusEFI into that cut
+-- https://en.wikipedia.org/wiki/Man-in-the-middle_attack
+
+-- this controls onCanRx rate as well!
+setTickRate(300)
+
+ECU_BUS = 1
+-- really 'not ECU'
+TCU_BUS = 2
+
+hexstr = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, "A", "B", "C", "D", "E", "F" }
+
+function toHexString(num)
+	if num == 0 then
+		return '0'
+	end
+
+	local result = ""
+	while num > 0 do
+		local n = num % 16
+		result = hexstr[n + 1] ..result
+		num = math.floor(num / 16)
+	end
+	return result
+end
+
+function arrayToString(arr)
+	local str = ""
+	local index = 1
+	while arr[index] ~= nil do
+		str = str.." "..toHexString(arr[index])
+		index = index + 1
+	end
+	return str
+end
+
+totalEcuMessages = 0
+totalTcuMessages = 0
+
+function onMotor1(bus, id, dlc, data)
+    engineTorque = getBitRange(data, 8, 8) * 0.39
+    rpm = getBitRange(data, 16, 16) * 0.25
+    tps = getBitRange(data, 40, 8) * 0.4
+    torqueLoss = getBitRange(data, 48, 8) * 0.39
+    requestedTorque = getBitRange(data, 56, 8) * 0.39
+    
+    print ('engineTorque ' .. engineTorque .. ' RPM ' .. rpm)
+    print ('torqueLoss ' .. torqueLoss ' requestedTorque ' .. requestedTorque)
+    
+end
+
+
+function printAndDrop(bus, id, dlc, data)
+    print('Dropping ' ..arrayToString(data))
+end
+
+function onAnythingFromECU(bus, id, dlc, data)
+    totalEcuMessages = totalEcuMessages + 1
+    txCan(TCU_BUS, id, 0, data) -- relay non-TCU message to TCU
+end
+
+function onAnythingFromTCU(bus, id, dlc, data)
+    totalTcuMessages = totalTcuMessages + 1
+    txCan(ECU_BUS, id, 0, data) -- relay non-ECU message to ECU
+end
+
+-- VAG Motor_1 just as example
+ canRxAdd(ECU_BUS, 0x280, onMotor1)
+
+-- last option: unconditional forward of all remaining messages
+canRxAddMask(ECU_BUS, 0, 0, onAnythingFromECU)
+canRxAddMask(TCU_BUS, 0, 0, onAnythingFromTCU)
+
+everySecondTimer = Timer.new()
+
+function onTick()
+    if everySecondTimer:getElapsedSeconds() > 1 then
+        everySecondTimer:reset()
+        print("Total from ECU " .. totalEcuMessages .. " from TCU " .. totalTcuMessages)
+    end
+end
+
+
+
+```