Exemplo n.º 1
0
    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)
Exemplo n.º 2
0
    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)
Exemplo n.º 3
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])))
Exemplo n.º 4
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])))