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https://git.kernel.org/pub/scm/bluetooth/bluez.git
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62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
Android Socket protocol for Bluetooth
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=====================================
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Since Android switched from BlueZ (where sockets where nicely implemented) to
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Bluedroid user space stack there is a need to emulate bluetooth sockets.
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Android Bluetooth Socket Hardware Abstraction Layer (HAL) bt_sock.h has
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only 2 functions:
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static btsock_interface_t sock_if = {
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sizeof(sock_if),
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sock_listen,
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sock_connect
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};
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with following parameters:
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sock_listen(btsock_type_t type, const char *service_name,
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const uint8_t *uuid, int chan, int *sock_fd, int flags)
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sock_connect(const bt_bdaddr_t *bdaddr, btsock_type_t type,
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const uint8_t *uuid, int chan, int *sock_fd, int flags)
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socket type RFCOMM is only supported at the moment. uuid and channel used
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to decide where to connect.
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sockfd is used to return socket fd to Android framework. It is used to inform
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framework when remote device is connected.
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listen()
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========
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Listens on RFCOMM socket, socket channel is either found based on uuid or
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channel parameter used directly. Returns sock_fd to Android framework.
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Through this sock_fd channel number as (int) needs to be written right after
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listen() succeeds.
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When remote device is connected to this socket we shall send accept signal
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through sock_fd
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connect()
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=========
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Connects to remote device specified in bd_addr parameter. Socket channel is
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found by SDP search of remote device by supplied uuid. Returns sock_fd to
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Android framework.
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Through this sock_fd channel number as (int) needs to be written right after
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connects() succeeds.
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When remote device is connected to this socket we shall send connect signal
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through sock_fd
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The format of connect/accept signal is shown below:
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struct hal_sock_connect_signal {
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short size;
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uint8_t bdaddr[6];
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int channel;
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int status;
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} __attribute__((packed));
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