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l2cap_hci.go
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l2cap_hci.go
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//go:build ninafw || hci || cyw43439
package bluetooth
import (
"encoding/binary"
"encoding/hex"
)
const (
connectionParamUpdateRequest = 0x12
connectionParamUpdateResponse = 0x13
)
type l2capConnectionParamReqPkt struct {
minInterval uint16
maxInterval uint16
latency uint16
timeout uint16
}
func (l *l2capConnectionParamReqPkt) Write(buf []byte) (int, error) {
l.minInterval = binary.LittleEndian.Uint16(buf[0:])
l.maxInterval = binary.LittleEndian.Uint16(buf[2:])
l.latency = binary.LittleEndian.Uint16(buf[4:])
l.timeout = binary.LittleEndian.Uint16(buf[6:])
return 8, nil
}
func (l *l2capConnectionParamReqPkt) Read(p []byte) (int, error) {
binary.LittleEndian.PutUint16(p[0:], l.minInterval)
binary.LittleEndian.PutUint16(p[2:], l.maxInterval)
binary.LittleEndian.PutUint16(p[4:], l.latency)
binary.LittleEndian.PutUint16(p[6:], l.timeout)
return 8, nil
}
type l2capConnectionParamResponsePkt struct {
code uint8
identifier uint8
length uint16
value uint16
}
func (l *l2capConnectionParamResponsePkt) Read(p []byte) (int, error) {
p[0] = l.code
p[1] = l.identifier
binary.LittleEndian.PutUint16(p[2:], l.length)
binary.LittleEndian.PutUint16(p[4:], l.value)
return 6, nil
}
type l2cap struct {
hci *hci
}
func newL2CAP(hci *hci) *l2cap {
return &l2cap{
hci: hci,
}
}
func (l *l2cap) addConnection(handle uint16, role uint8, interval, timeout uint16) error {
if role != 0x01 {
return nil
}
var b [12]byte
b[0] = connectionParamUpdateRequest
b[1] = 0x01
binary.LittleEndian.PutUint16(b[2:], 8)
binary.LittleEndian.PutUint16(b[4:], interval)
binary.LittleEndian.PutUint16(b[6:], interval)
binary.LittleEndian.PutUint16(b[8:], 0)
binary.LittleEndian.PutUint16(b[10:], timeout)
return l.sendReq(handle, b[:])
}
func (l *l2cap) removeConnection(handle uint16) error {
return nil
}
func (l *l2cap) handleData(handle uint16, buf []byte) error {
code := buf[0]
identifier := buf[1]
//length := binary.LittleEndian.Uint16(buf[2:4])
if debug {
println("l2cap.handleData:", handle, "data:", hex.EncodeToString(buf))
}
// TODO: check length
switch code {
case connectionParamUpdateRequest:
return l.handleParameterUpdateRequest(handle, identifier, buf[4:])
case connectionParamUpdateResponse:
return l.handleParameterUpdateResponse(handle, identifier, buf[4:])
}
return nil
}
func (l *l2cap) handleParameterUpdateRequest(connectionHandle uint16, identifier uint8, data []byte) error {
if debug {
println("l2cap.handleParameterUpdateRequest:", connectionHandle, "data:", hex.EncodeToString(data))
}
req := l2capConnectionParamReqPkt{}
req.Write(data)
// TODO: check against min/max
resp := l2capConnectionParamResponsePkt{
code: connectionParamUpdateResponse,
identifier: identifier,
length: 2,
value: 0,
}
var b [6]byte
resp.Read(b[:])
if err := l.sendReq(connectionHandle, b[:]); err != nil {
return err
}
// valid so update connection parameters
if resp.value == 0 {
return l.hci.leConnUpdate(connectionHandle, req.minInterval, req.maxInterval, req.latency, req.timeout)
}
return nil
}
func (l *l2cap) handleParameterUpdateResponse(connectionHandle uint16, identifier uint8, data []byte) error {
if debug {
println("l2cap.handleParameterUpdateResponse:", connectionHandle, "data:", hex.EncodeToString(data))
}
// for now do nothing
return nil
}
func (l *l2cap) sendReq(handle uint16, data []byte) error {
if debug {
println("l2cap.sendReq:", handle, "data:", hex.EncodeToString(data))
}
return l.hci.sendAclPkt(handle, signalingCID, data)
}