ant+ channel automatically

[Woody Hung]

I used nRF5_SDK_14.1.0_1dda907.

I opened the bpwr channel then received ant+ packet.

The device received ant+ packet successful.

How do i know that how long time the device not receive packet will close ant+ channel automatically.

[Kenneth]

The default search timeout is 25 seconds. You can change this by calling sd_ant_channel_rx_search_timeout_set().

[Woody Hung]

If already the assigned Id of channel.

The device already received ant+ packet then the device not receive packet.

Also reference the search timeout?

[Kenneth]

This is not the same no.

Earlier you would get 5 EVENT_RX_FAIL events,  before you would get a EVENT_RX_FAIL_GO_TO_SEARCH indicate that the stack now will search for the master again.

However I believe that the number of EVENT_RX_FAIL have been increased from 5 to 8, so you may test with the specific softdevice by turning OFF the master and measure the number of EVENT_RX_FAIL until EVENT_RX_FAIL_GO_TO_SEARCH occurs.

[Woody Hung]

Thank your detailed explanation!!

So,after EVENT_RX_FAIL_GO_TO_SEARCH occurs, default search timeout is 25 seconds.

What happens after search timeout ? 

Only close ant+ channel ?

[testy]

Sequence of events:

EVENT_RX -> EVENT_RX_FAIL -> EVENT_RX_FAIL_GO_TO_SEARCH -> EVENT_RX_SEARCH_TIMEOUT -> EVENT_CHANNEL_CLOSED

Timeouts:

sd_ant_channel_low_priority_rx_search_timeout_set
9.5.2.15 Channel Low Priority Search Timeout (0x63), default: 5s
+
sd_ant_channel_rx_search_timeout_set
9.5.2.5 Channel Search Timeout (0x44), default: 25s

ANT protocol

Channel search