Issues

This article lists the current issues of the WISP Extended Runtime.

WISP Firmware

Investigate if WISP_doRFID() is corrupting the stack and if it is, fix it.
To improve the efficiency of WIO functions, do not use wio_status_t for functions that does not throw any error. Return values directly instead of returning results through parameters.
Refactor the WIO buffer API to make it more efficient. Remove the bounds check inside wio_read() and wio_write(), and provide a spearate function for bounds check of the buffer. Inline as much WIO buffer functions as possible.
The WIO timer API still has bugs and sometimes can't be used. The current_time variable is sometimes mysteriously modified outside the WIO API code, causing the software timer system to fail. Investigate the cause of the problem and fix it.

Refactor function signatures and usage of WIO functions to bring WTP on par with the WIO API.
Currently function wtp_after_do_rfid() is directly inlined in the RFID loop, because the WTP code fails to work if the code is replaced by a function call. The problem might be related with potential stack corruption inside WISP_doRFID(). Before the problem is solved inside the firmware, see if we have any workarounds that solve the problem.
Because of the timer issue inside the WISP firmware, retransmission for the uplink isn't enabled. Implements the uplink retransmission using WIO timers. The server-side retransmission code can be used as a reference.
Support multiple OpSpec inside one AccessSpec. The current way that the WTP hook functions are called isn't compatible with that. May also requires optimization of the WTP client-side code.
Acknowledgement, timeout and retransmission mechanism for control packets. Many types of control packets needs to be delivered reliably, and currently WTP has no such mechansim.

Improves the efficiency of the u-RPC code and refactor its usage of WIO functions.
Refactor the server-side WISP ERT code to allow custom services and configurations being applied for the wisp-ert command line utilities.