+ if len(c.channels) >= 0x7fff {
+ return nil, errors.New("all channel IDs are used")
+ }
+ for {
+ c.nextChannelID++
+ chID := c.nextChannelID & 0x7fff
+ _, ok := c.channels[chID]
+ if !ok {
+ channel.id = chID
+ c.channels[chID] = channel
+ break
+ }
+ }