def send(self, method, token, path, has_payload=False, payload=None):
if has_payload:
frame = "%s%s%s%s" % (tinypacks.pack(method),
tinypacks.pack(token), tinypacks.pack(path),
tinypacks.pack(payload))
else:
frame = "%s%s%s" % (tinypacks.pack(method), tinypacks.pack(token),
tinypacks.pack(path))
frame += struct.pack(">H", crc16.crc16str(frame))
if self.debug:
print "TX:",
for c in frame:
print "%X" % ord(c),
print "[%i]" % len(frame)
try:
self.fd.write("\x7E")
for byte in frame:
if byte == "\x7E":
self.fd.write("\x7D\x5E")
elif byte == "\x7D":
self.fd.write("\x7D\x5D")
else:
self.fd.write(byte)
self.fd.write("\x7E")
except IOError as err:
raise PostmanError("Frame sending failed: %s" % err)
def send(self, method, token, path, has_payload=False, payload=None):
if has_payload:
frame = "%s%s%s%s" % (tinypacks.pack(method), tinypacks.pack(token), tinypacks.pack(path), tinypacks.pack(payload))
else:
frame = "%s%s%s" % (tinypacks.pack(method), tinypacks.pack(token), tinypacks.pack(path))
frame += struct.pack(">H", crc16.crc16str(frame))
if self.debug:
print "TX:",
for c in frame:
print "%X" % ord(c),
print "[%i]" % len(frame)
try:
self.fd.write("\x7E")
for byte in frame:
if byte == "\x7E":
self.fd.write("\x7D\x5E")
elif byte == "\x7D":
self.fd.write("\x7D\x5D")
else:
self.fd.write(byte)
self.fd.write("\x7E")
except IOError as err:
raise PostmanError("Frame sending failed: %s" % err)
def receive(self):
frame = ""
byte = ""
try:
while (byte != "\x7E" or frame == ""):
byte = self.fd.read(1)
if not byte:
raise PostmanError("Frame receiving timed out.")
if byte == "\x7D":
frame += chr(ord(self.fd.read(1)) | 32)
elif byte != "\x7E":
frame += byte
except PostmanError:
raise
except IOError as err:
raise PostmanError("Frame receiving failed: %s" % err)
if self.debug:
print "RX:",
for c in frame:
print "%X" % ord(c),
print "[%i]" % len(frame)
if len(frame) >= 4 and crc16.crc16str(frame[:-2]) == struct.unpack(
">H", frame[-2:])[0]:
frame = frame[:-2]
response, frame = tinypacks.unpack(frame)
if frame:
token, frame = tinypacks.unpack(frame)
if frame:
payload, frame = tinypacks.unpack(frame)
return [response, token, payload]
else:
return [response, token]
else:
return [response]
else:
raise PostmanError("Frame receiving failed, bad CRC %s != %s " %
(hex(crc16.crc16str(frame[:-2])),
hex(struct.unpack(">H", frame[-2:])[0])))
def receive(self):
frame = ""
byte = ""
try:
while (byte != "\x7E" or frame == ""):
byte = self.fd.read(1)
if not byte:
raise PostmanError("Frame receiving timed out.")
if byte == "\x7D":
frame += chr(ord(self.fd.read(1))|32)
elif byte != "\x7E":
frame += byte
except PostmanError:
raise
except IOError as err:
raise PostmanError("Frame receiving failed: %s" % err)
if self.debug:
print "RX:",
for c in frame:
print "%X" % ord(c),
print "[%i]" % len(frame)
if len(frame) >= 4 and crc16.crc16str(frame[:-2]) == struct.unpack(">H", frame[-2:])[0]:
frame = frame[:-2]
response, frame = tinypacks.unpack(frame)
if frame:
token, frame = tinypacks.unpack(frame)
if frame:
payload, frame = tinypacks.unpack(frame)
return [response, token, payload]
else:
return [response, token]
else:
return [response]
else:
raise PostmanError("Frame receiving failed, bad CRC %s != %s " % (hex(crc16.crc16str(frame[:-2])), hex(struct.unpack(">H", frame[-2:])[0])))