What is the IrDA definition of mandatory software protocols, ( IAS, IrLMP, IrLAP)?
IAS (Information Access Service): A mandatory protocol defined by the IrDA to be used as a set along with IrLMP and IrLAP protocols. Each device maintains a mini-database of the services it provides, and their attributes. A required service attribute is the LSAP-SEL. Unlike TCP/IP where service ( well known ) port numbers are known in advance, each primary device must ask the secondary device what its port (LSAP-SEL) is for the service it want to connect to. IAS uses the Information Access Protocol (IAP) to resolve query’s and responses between an IAS client and server. A secondary stack will generally contain an IAS server. IrLMP (Link Management Protocol): A mandatory protocol defined by the IrDA to be used as a set along with IrLAP and IR device PHY protocols. Provides fundamental discovery, multiplexing, and link control operations between stations. It supports multiplexing of multiple applications over a single IrLAP link. It also provides protocol and service discovery via the IA
