Abstract: A Radio Interface Layer (RIL) is disclosed. The RIL comprises an API set which provides a level of abstraction between the radio on a cell phone and the software of the cell phone. The API set of RIL is roughly based on the GSM AT interface as defined in GSM specifications 07.05 and 07.07. The API set provides access to functionality contained within a cellular telephone, such as a GSM or CDMA compatible telephone. These APIs allow applications running on an operating system in the cellular telephone to issue commands without knowledge of the underlying radio structure of the cellular telephone and specific knowledge of the GSM-type commands. For example, these APIs allow the applications to access to phonebook entries, restrict access to data and functionality using passwords, access file and message storage, and perform many other functions. The RIL is divided into a hardware-independent proxy layer, called by various software components, and a driver layer that is hardware-specific.

Abstract: The present invention provides for a virtual serial port (VSP) situated between a serial port in a mobile electronic device, applications that require a serial port connection handle, and other applications that require command-mode access to the serial port. Data-communication applications (e.g. web browsing, e-mail, etc.) connect to the serial port through the VSP. The VSP creates a virtual connection handle that is returned to the application. Command-mode requests (e.g., short messaging requests) are received by the hardware abstraction layer, translated into command-mode messages (e.g., AT commands) and placed in a queue. The VSP multiplexes the serial port between the currently-open data communication session (data-mode) and command-mode messages by periodically suspending the currently-open connection and processing one or more command-mode messages that are in the queue. A buffer continually stores incoming data while the data communication session is suspended.

Abstract: A method and system for routing messages received by a device is described. The router routes messages to applications associated with a provider that recognizes an incoming message type. Providers register with the router to receive messages of a particular type. The providers are prioritized so that the router delivers messages to the providers based on the assigned priority. The router inquires with the providers in their relative assigned priority. The router stops inquiring the providers once an appropriate provider for the message has been found. If the message does not belong to the provider then the next provider is queried. Before delivering the message to the application, the provider formats the message to the specifications provided by the application.