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from datetime import datetime
class StompCommand:
def __init__(self, action, value):
self.action = action
self.value = value
self.raw_bytes = bytearray(32)
self.encode_bytes()
def encode_bytes(self):
self.encode_time()
self.encode_action()
self.encode_value()
self.build_last_16_bytes()
def encode_time(self):
epoch = datetime.now().strftime("%s")
epoch_hex = hex(int(epoch))[2:]
epoch_bytes = bytearray.fromhex(epoch_hex)
epoch_bytes.reverse()
for i in range(4):
self.raw_bytes[i] = epoch_bytes[i]
def encode_action(self):
self.raw_bytes[9] = 0x00
if(self.action == "button"):
self.raw_bytes[8] = 0x01
self.raw_bytes[10] = 0x11
self.raw_bytes[11] = 0x01
elif(self.action == "rotary"):
self.raw_bytes[8] = 0x01
self.raw_bytes[10] = 0x08
self.raw_bytes[11] = 0x00
def encode_value(self):
if(self.value == "pressed"):
self.raw_bytes[12] = 0x01
elif(self.value == "released"):
self.raw_bytes[12] = 0x00
elif(self.value == "clock wise"):
self.raw_bytes[12] = 0x01
elif(self.value == "counter clock"):
self.raw_bytes[12] = 0xff
def build_last_16_bytes(self):
# build the last 16 bytes
for i in range(6):
self.raw_bytes[16+i] = self.raw_bytes[i]
def bytes_to_hex(self):
bytes_str = ""
for i in range(len(self.raw_bytes)):
bytes_str = bytes_str + str(self.raw_bytes[i]) + ' '
return bytes_str
def __str__(self):
return "Action: " + self.action + "\nValue: " + self.value + "\nBytes: " + self.bytes_to_hex()
class StompEvent:
def __init__(self, raw_bytes):
self.raw_bytes = raw_bytes
self.action = "unknown"
self.value = "unknown"
self.decode_bytes()
def print_bytes(self):
bytes_str = ""
for i in range(len(self.raw_bytes)):
bytes_str = bytes_str + self.raw_bytes[i].encode('hex') + ' '
print bytes_str
print '---'*32
def decode_bytes(self):
self.decode_action()
self.decode_value()
self.decode_time()
def decode_action(self):
action_byte_1 = self.raw_bytes[10].encode('hex')
action_byte_2 = self.raw_bytes[11].encode('hex')
if(action_byte_1 == "11" and action_byte_2 == "01"):
self.action = "button"
elif(action_byte_1 == "08" and action_byte_2 == "00"):
self.action = "rotary"
def decode_value(self):
value_byte = self.raw_bytes[12].encode('hex')
if(value_byte == "00"):
self.value = "released"
elif(value_byte == "01"):
if(self.action == "button"):
self.value = "pressed"
elif(self.action == "rotary"):
self.value = "clock wise"
elif(value_byte == "ff"):
self.value = "counter clock"
def decode_time(self):
# the first 4 bytes form the time
time_bytes = self.raw_bytes[0:4]
time_bytes.reverse()
time_hex = ""
for i in range(len(time_bytes)):
time_hex = time_hex + time_bytes[i].encode('hex')
self.epoch = int(time_hex, 16)
self.date_time = datetime.fromtimestamp(self.epoch)
def __str__(self):
return "Action: " + self.action + "\nValue: " + self.value + "\nEpoch: " + str(self.epoch) + "\nDatetime: " + str(self.date_time)
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