Python bert.decode not working between Javascript and Python.

q-bert-decode-js-py.md

So I'm using Bert in js with MQTT pushing it over ws to rabbitmq where a pika consumer reads the body and tries to decode the js BERT encoded body; and it fails.

    def on_message(self, unused_channel, basic_deliver, properties, body):
        print("raw body:")
        print(body)
        print("oct body:")
        for c in body: print(c)
        berty = bert.decode(body)

Output

raw body:
b'\xc2\x83h\x06k\x00\x03movk\x00\x07Anon839n\x06\x00f\xc3\xa0\xc3\x94`V\x01b\x00\x00\x03\x1bb\x00\x00\x01Ph\x02d\x00\x04bertd\x00\x05false'
oct body:
194
131
104
6
107
0
3
109
111
118
107
0
7
65
110
111
110
56
51
57
110
6
0
102
195
160
195
148
96
86
1
98
0
0
3
27
98
0
0
1
80
104
2
100
0
4
98
101
114
116
100
0
5
102
97
108
115
101
Traceback (most recent call last):
  File "consume.py", line 363, in <module>
    main()
  File "consume.py", line 357, in main
    example.run()
  File "consume.py", line 328, in run
    self._connection.ioloop.start()
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/adapters/select_connection.py", line 354, in start
    self.poll()
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/adapters/select_connection.py", line 602, in poll
    self._process_fd_events(fd_event_map, write_only)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/adapters/select_connection.py", line 443, in _process_fd_events
    handler(fileno, events, write_only=write_only)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/adapters/base_connection.py", line 364, in _handle_events
    self._handle_read()
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/adapters/base_connection.py", line 415, in _handle_read
    self._on_data_available(data)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/connection.py", line 1347, in _on_data_available
    self._process_frame(frame_value)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/connection.py", line 1427, in _process_frame
    self._deliver_frame_to_channel(frame_value)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/connection.py", line 1028, in _deliver_frame_to_channel
    return self._channels[value.channel_number]._handle_content_frame(value)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/channel.py", line 896, in _handle_content_frame
    self._on_deliver(*response)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/pika/channel.py", line 983, in _on_deliver
    header_frame.properties, body)
  File "consume.py", line 276, in on_message
    berty = bert.decode(body)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/bert/codec.py", line 41, in decode
    obj = self.erlang_decoder.decode(bytes, offset)
  File "/home/ubuntu/workspace/pika-consumer/env/lib/python3.4/site-packages/erlastic/codec.py", line 28, in decode
    raise EncodingError("Bad version number. Expected %d found %d" % (FORMAT_VERSION, version))
erlastic.codec.EncodingError: Bad version number. Expected 131 found 194

I generate the body in js with the following code:

chat.Message.prototype.mqtt = function(topic) {
    var t;
    if (this.msg.type == this.types.MESSAGE) {
        t = Bert.tuple(this.msg.type, this.sessionId()  , Date.now(), this.msg.text)
    } else
    if (this.msg.type == this.types.MOVE) {
        t = Bert.tuple(this.msg.type, this.sessionId(), Date.now(), this.msg.x, this.msg.y, this.msg.idle)
    } else
    if (this.msg.type == this.types.CREATE) {
        t = Bert.tuple(this.msg.type, this.sessionId(), Date.now())
    } else
    if (this.msg.type == this.types.ACTION) {
        t = Bert.tuple(this.msg.type, this.sessionId(), Date.now(), this.msg.floor)
    } else 
    if (this.msg.type == this.types.BREAK) {
        t = Bert.tuple(this.msg.type, this.sessionId(), Date.now(), this.msg.x, this.msg.y)
    } else 
    {
        console.error('unknown type for mqtt', msg)
        chat.vm.addMessage(new chat.Message('Sending unknown message type', 'msg', true));
        return;
    }
    var message = new Paho.MQTT.Message(Bert.encode(t));
    message.destinationName = topic || (chat.config.topic + '.' + gm.config.game.level.split('/')[1]);
    console.log(new ArrayBuffer(Bert.encode(t)))
    console.log(message.payloadBytes);
    return message;
}

With output in my browser console:

ArrayBuffer {}
main.js:65 [194, 131, 104, 6, 107, 0, 3, 109, 111, 118, 107, 0, 7, 65, 110, 111, 110, 56, 51, 57, 110, 6, 0, 194, 143, 194, 165, 195, 166, 96, 86, 1, 99, 54, 46, 56, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 55, 49, 52, 48, 51, 54, 101, 43, 48, 49, 0, 0, 0, 0, 0, 97, 194, 176, 104, 2, 100, 0, 4, 98, 101, 114, 116, 100, 0, 5, 102, 97, 108, 115, 101]
main.js:64 ArrayBuffer {}
main.js:65 [194, 131, 104, 6, 107, 0, 3, 109, 111, 118, 107, 0, 7, 65, 110, 111, 110, 56, 51, 57, 110, 6, 0, 194, 159, 194, 165, 195, 166, 96, 86, 1, 97, 72, 97, 194, 176, 104, 2, 100, 0, 4, 98, 101, 114, 116, 100, 0, 5, 102, 97, 108, 115, 101]

Where does the 194 come from?