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DESCRIPTION

The SDP_PUT8(), SDP_PUT16(), SDP_PUT32(), SDP_PUT64() and SDP_PUT128() macros are used to put byte, short, long, long long and 128-bit integer into the buffer pointed by cp pointer. The pointer is automatically advanced.

SDP_GET_UUID128() and SDP_PUT_UUID128() macros are used to get and put 128-bit UUID into the buffer pointed by cp pointer. The pointer is automatically advanced.

The sdp_open() and sdp_open_local() functions each return a pointer to an opaque object describing SDP session. The l argument passed to sdp_open() function should point to a source BD_ADDR. If source BD_ADDR is NULL then source address BDADDR_ANY is used. The r argument passed to sdp_open() function should point to a non-NULL remote BD_ADDR. Remote BD_ADDR cannot be BDADDR_ANY. The sdp_open_local() function takes path to the control socket and opens a connection to a local SDP server. If path to the control socket is NULL then default /var/run/sdp path will be used.

The sdp_close() function terminates active SDP session and deletes SDP session object. The xs parameter should point to a valid SDP session object created with sdp_open() or sdp_open_local().

The sdp_error() function returns last error that is stored inside SDP session object. The xs parameter should point to a valid SDP session object created with sdp_open() or sdp_open_local(). The error value returned can be converted to a human readable message by calling strerror(3) function.

The sdp_search() function is used to perform SDP Service Search Attribute Request. The xs parameter should point to a valid SDP session object created with sdp_open() or sdp_open_local(). The pp parameter is a Service Search Pattern - an array of one or more Service Class IDs. The maximum number of Service Class IDs in the array is 12. The plen parameter is the length of the Service Search pattern. The ap parameter is an Attribute ID Range List - an array of one or more SDP Attribute ID Range. Each attribute ID Range is encoded as a 32-bit unsigned integer data element, where the high order 16 bits are interpreted as the beginning attribute ID of the range and the low order 16 bits are interpreted as the ending attribute ID of the range. The attribute IDs contained in the Attribute ID Ranges List must be listed in ascending order without duplication of any attribute ID values. Note that all attributes may be requested by specifying a range of 0x0000-0xFFFF. The alen parameter is the length of the Attribute ID Ranges List. The SDP_ATTR_RANGE(lo, hi) macro can be used to prepare Attribute ID Range. The vp parameter should be an array of sdp_attr_t structures. Each sdp_attr_t structure describes single SDP attribute and defined as follows:

struct sdp_attr {
        uint16_t        flags;
#define SDP_ATTR_OK             (0 << 0)
#define SDP_ATTR_INVALID        (1 << 0)
#define SDP_ATTR_TRUNCATED      (1 << 1)
        uint16_t        attr;  /* SDP_ATTR_xxx */
        uint32_t        vlen;  /* length of the value[] in bytes */
        uint8_t        *value; /* base pointer */
};
typedef struct sdp_attr         sdp_attr_t;
typedef struct sdp_attr *       sdp_attr_p;

The caller of the sdp_search() function is expected to prepare the array of sdp_attr structures and for each element of the array both vlen and value must be set. The sdp_search() function will fill each sdp_attr_t structure with attribute and value, i.e., it will set flags, attr and vlen fields. The actual value of the attribute will be copied into value buffer. Note: attributes are returned in the order they appear in the Service Search Attribute Response. SDP server could return several attributes for the same record. In this case the order of the attributes will be: all attributes for the first records, then all attributes for the secord record etc.

The sdp_attr2desc() and sdp_uuid2desc() functions each take a numeric attribute ID/UUID value and convert it to a human readable description.

The sdp_register_service() function is used to register service with the local SDP server. The xss parameter should point to a valid SDP session object obtained from sdp_open_local(). The uuid parameter is a SDP Service Class ID for the service to be registered. The bdaddr parameter should point to a valid BD_ADDR. The service will be only advertised if request was received by the local device with bdaddr. If bdaddr is set to BDADDR_ANY then the service will be advertised to any remote devices that queries for it. The data and datalen parameters specify data and size of the data for the service. Upon successful return sdp_register_service() will populate handle with the SDP record handle. This parameter is optional and can be set to NULL.

The sdp_unregister_service() function is used to unregister service with the local SDP server. The xss parameter should point to a valid SDP session object obtained from sdp_open_local(). The handle parameter should contain a valid SDP record handle of the service to be unregistered.

The sdp_change_service() function is used to change data associated with the existing service on the local SDP server. The xss parameter should point to a valid SDP session object obtained from sdp_open_local(). The handle parameter should contain a valid SDP record handle of the service to be changed. The data and datalen parameters specify data and size of the data for the service.

bdaddr_t       remote;
uint8_t        buffer[1024];
void          *ss    = NULL;
uint16_t       serv  = SDP_SERVICE_CLASS_SERIAL_PORT;
uint32_t       attr  = SDP_ATTR_RANGE(
                            SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST,
                            SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
sdp_attr_t     proto = { SDP_ATTR_INVALID,0,sizeof(buffer),buffer };

/* Obtain/set remote BDADDR here */

if ((ss = sdp_open(BDADDR_ANY, remote)) == NULL)
        /* exit ENOMEM */
if (sdp_error(ss) != 0)
        /* exit sdp_error(ss) */

if (sdp_search(ss, 1, &serv, 1, &attr, 1, &proto) != 0)
        /* exit sdp_error(ss) */

if (proto.flags != SDP_ATTR_OK)
        /* exit see proto.flags for details */

/* If we got here then we have attribute value in proto.value */