gettodo implemented for nokia series 40? "unhandled frame"

[Chris Parsons]

Hello,
I'm having trouble with getting todos from my Nokia 5310. I can communicate 
with the phone and send SMS messages OK but I want to be able to delete and 
create todo items. If this functionality is currently unsupported with this 
model then I could potentially help develop it, though I don't know where to 
start with the protocol (but haven't tried looking yet). 

Phone: 5310 XpressMusic (Series40 I think)
Received model RM-303
Manufacturer : Nokia
Revision     : V 09.42

Connection: bluetooth
Gnokii: Version 0.6.27 built from tarball

Command line:
gnokii --gettodo 1 end

Debug log:
GNOKII Version 0.6.27
LOG: debug mask is 0x1
Config read from file /home/chris/.gnokiirc.
phone instance config:
model = series40
port = 00:1F:DF:48:A6:6B
connection = bluetooth
initlength = default
serial_baudrate = 19200
serial_write_usleep = -1
handshake = software
require_dcd = 0
smsc_timeout = 10
rfcomm_channel = 0
sm_retry = 0
Connecting
Serial device: opening device 00:1F:DF:48:A6:6B
Channel: 14
Channel: 14
Using channel: 14
Getting model...
Message sent: 0x1b / 0x0006
00 01 00 07 01 00                               |                 
Message received: 0x1b / 0x003a
01 36 00 08 00 01 58 34 00 30 56 20 30 39 2e 34 |  6    X4 0V 09.4
32 0a 30 37 2d 31 31 2d 30 38 0a 52 4d 2d 33 30 | 2 07-11-08 RM-30
33 0a 28 63 29 20 4e 6f 6b 69 61 20 20 20 20 20 | 3 (c) Nokia     
20 20 20 20 20 20 20 0a 43 00                   |         C       
Received message type 1b
model length: 6
Received model RM-303
Message sent: 0x55 / 0x000a
00 01 00 15 01 00 00 00 00 00                   |                 
Message received: 0x55 / 0x000a
01 00 00 f0 14 15 01 00 00 00                   |                 
Received message type 55
Unknown subtype of type 0x01 (240)
UNHANDLED FRAME RECEIVED
request: 0x55 / 0x000a
00 01 00 15 01 00 00 00 00 00                   |                 
reply: 0x55 / 0x000a
01 00 00 f0 14 15 01 00 00 00                   |                 
Please read Docs/Bugs and send a bug report!
The ToDo note could not be read: The given location is empty.
Serial device: closing device