Echelon LonTal Stack - Manual (Page 5)

LonTalk Stack Developer’s Guide v
Specifying Code Generator Preferences............................................... 91
Compiling and Generating the Files .................................................... 92
Using the LonTalk Interface Developer Files ............................................ 93
Copied Files............................................................................................ 94
LonNvTypes.h and LonCpTypes.h ....................................................... 94
FtxlDev.h................................................................................................ 95
FtxlDev.c ................................................................................................ 95
project.xif and project.xfb...................................................................... 95
Using Types .................................................................................................. 95
Bit Field Members ................................................................................. 97
Enumerations ........................................................................................ 98
Floating Point Variables ....................................................................... 98
Network Variable and Configuration Property Declarations ................. 100
Constant Configuration Properties........................................................... 102
The Network Variable Table ..................................................................... 103
Network Variable Attributes .............................................................. 103
The Message Tag Table ............................................................................. 104
8 Developing a LonTalk Stack Device Application...........................105
Overview of a LonTalk Stack Device Application.................................... 106
Using the LonTalk API ....................................................................... 106
Callbacks and Events..........................................................................108
Integrating the Application with an Operating System ................... 108
Providing Persistent Storage for Non-Volatile Data......................... 109
Restoring Non-Volatile Data ........................................................ 110
Writing Non-Volatile Data ........................................................... 111
Tasks Performed by a LonTalk Stack Application .................................. 112
Initializing the LonTalk Stack Device ............................................... 113
Periodically Calling the Event Pump................................................. 113
Sending a Network Variable Update ................................................. 115
Receiving a Network Variable Update from the Network................ 117
Handling a Network Variable Poll Request from the Network........ 120
Handling Changes to Changeable-Type Network Variables............ 120
Validating a Type Change ............................................................ 121
Processing a Type Change............................................................ 122
Processing a Size Change ............................................................. 123
Rejecting a Type Change .............................................................. 124
Handling Dynamic Network Variables .............................................. 124
Communicating with Other Devices Using Application
Messages .............................................................................................. 125
Sending an Application Message to the Network ....................... 126
Receiving an Application Message from the Network................ 126
Handling Management Commands.................................................... 126
Handling Local Network Management Tasks ................................... 127
Handling Reset Events........................................................................127
Querying the Error Log.......................................................................127
Working with ECS Devices........................................................................ 127
Using Direct Memory Files........................................................................ 128
The DMF Memory Window................................................................. 129
File Directory ....................................................................................... 130
Shutting Down the LonTalk Stack device................................................ 131
9 Developing an IP-852 Router Application........................................133
Developing an IP-852 Router Application ................................................ 134