RFModem Progress Log
RFModem progress, ideas, and design decisions.

2004 Aug 26 - Several Maxstream RF modules are now available, 2.4 GHz and 915 MHz bands

There are now several versions of plug-compatible RF Modems. We have various versions of these now for testing.

2004 Aug 26 - Other RF Modem options

We have prototypes of a very low cost, low power, short range, 2.4 GHz RF Modem which is non-trivial to use and will take some support hardware and firmware. But the low price is very attractive. We're reading through the documents and planning to breadboard something as time allows. It's taking a back seat to JCX production.

We also received our Motorola/FreeScale Zigbee development kits. We're planning to do a JCX.Zigbee board of our own in September. This will involve a custom antenna design and FCC compliance testing.

2003 Sep 03 - RF modules delayed from manufacturere, progress more or less on hold

Late in August (instead of early June), we finally received some of the shorter-range, higher speed, lower cost modem modules. Now we are 100% consumed with the final JCX release and won't be able to get back to the modems until late Sep or early Oct.

2003 Jul 02 - back at work on JXTA support, how ours differs from JXME

There is a J2ME reference implementation for JXTA, see: http://jxme.jxta.org/servlets/ProjectHome but our implementation differs in some important ways:

  1. We do not use a proxy, so our J2ME implementation is truly peer-to-peer. Any two of our nodes can establish a network directly.
  2. We use XML format messages in the lower layers of the protocol, instead of the proxy-version binary messages.

2003 Jun 20 - completely new media- and link- layer hardware
We're changing to completely new RFModems made by MaxStream and have working prototype JSimm.RFModem hardware. This hardware was displayed at JavaOne in early June and will be used in various demos throughout the summer. More details will be posted here in July. These modems will also work with TStik (TINI400) in our new TILT400 socket board, and with SNAP in a TILT400 socket board, as well as from a PC. This enables the PC to be a TCP/IP-to-RF gateway.

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