[riot-notifications] [RIOT-OS/RIOT] pkg/openwsn: re-integrate the network stack as a package (#13824)

Francisco notifications at github.com
Tue May 26 10:52:05 CEST 2020

@fjmolinas commented on this pull request.

> + * In OpenWSN however, the `openserial` tool uses UART to feed external software
+ * running on a host computer such as
+ * [Openvisualizer](https://github.com/openwsn-berkeley/openvisualizer).
+ * To enable use of these tools, a UART adaptation is provided.
+ *
+ * By default when `openwsn_serial` (`openserial`) is used STDIO will be disabled
+ * (it will use `stdio_null`). When multiple uart are available STDIO and `openserial`
+ * can be used in parallel.
+ *
+ * OpenWSN uart abstraction makes use of tx hardware interrupts to execute a
+ * previously registered callback after every byte is sent out. These interrupts
+ * are currently not defined in RIOT in a generic way, so instead a timer is to
+ * fire shortly after a byte is written until sw_isr are possible.
+ *
+ * This implementation uses `ztimer` since its already used as an abstraction
+ * for `periph_rtt`.

It explains that it doesn't use `periph_timer` directly since `ztimer` is already pulled in as a dependency for `sctimer`, I'll rephrase.

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