Sun is expected to announce this week that it will make the Sun SPOT (Small Programmable Object Technology) device platform available via open source, but a user expressed concerns about Sun's commitment to the technology.

Sun SPOT is a Java-based experimental platform intended to enable development of products like wireless sensors, robotics, and communication devices. The open-sourcing is expected to be made official at the Java Mobile & Embedded Developer Days Conference in California, which is being held January 23-24.

"In this case, I think what's a little bit different is it's not just open-sourcing just the Sun SPOT code," said Roger Brinkley, mobile and embedded community leader at Sun. "It's everything related to Sun SPOT. It's the hardware, it's the software."

Included in the open source endeavor would be the Squawk virtual machine featured as part of Sun SPOT. Through the open-source move, Sun hopes to attract more developers to Sun SPOT. "The open-sourcing allows a lot more extension and development to occur," Brinkley said.

The plan calls for Sun SPOT to be offered under the GNU General Public License version 2, which means derivatives of GPL code and code that is combined with it must be redistributed. Sun, however, previously has permitted use of the "ClassPath" exception to the GPL, which enables combining of proprietary code with GPL ClassPath libraries without the need to redistribute proprietary code.

Contacted afterward, Sun SPOT user Bruce Boyes, president of Systronix, lauded the technology but had concerns about Sun's commitment to it. By classifying the technology as experimental, Sun shows no published commitment to make it available for any period of time commercially, he said. Systronix has been trying to get a commercial license for two years, he said.

"SPOT is a very cool educational and experimental device. We'd like it to become a great commercial and industrial device too. Systronix would like to help make that happen," Boyes said. Systronix is using Sun SPOT in robots, which could be networked and potentially be used in applications, such as roaming of airports to provide security. "We use the Sun SPOT as the application brain," said Boyes.

He also expressed concerns about the GPL, which has requirements that can place limits on its use in commercial ventures since software involving it has to be contributed back to the open-source arena. "Open-sourcing would be most interesting if there was a reasonable path to a commercial license," Boyes said.

Sun officials were not available to respond to Boyes's concerns on Friday afternoon.

In other happenings at next week's conference, application developers in the mobile and embedded space will get together to learn about different topics ranging from virtual machines to mobile clients. Presentations will be done by representatives from such companies as Nokia, Intel and, of course, Sun. James Gosling, CTO of Sun's Client Software who is widely considered the father of Java, will give a keynote presentation on Wednesday.

Java, according to Sun, is on 95 percent of mobile phones shipped today. Sun makes money off of mobile and embedded Java through commercial licenses that feature support services.

One topic that is not expected to get a lot of play at the event is Sun's JavaFX and JavaFX Mobile technology. The JavaFX platform, featuring JavaFX Mobile, is intended to provide a consistent and graphical user experience on systems ranging from desktops to mobile devices and other systems. More on JavaFX will be aired at the JavaOne conference in May in San Francisco, a Sun insider said.

Currently, Sun's new acquisition, MySQL, maker of the open source database of the same name, has not been factored into Sun's mobile plans, according to Brinkley. Sun agreed to acquire MySQL this week for US$1 billion, with the deal expected to close later this quarter or early in the next quarter.