`GPRS::isCallActive` fix

Seeed-Studio / GPRS_SIM900

library for GPRS shield with sim900 module.

MIT License

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`GPRS::isCallActive` fix #26

Closed jackdunger closed 6 years ago

jackdunger commented 6 years ago

Currently: GPRS::isCallActive sends AT+CPAS\r\n, reads back the response and then waits for OK\r\n. So, even when a call is in progress, it can miss the +CPAS response and return false by default.
This PR switches the wait and read commands.
Fixes #10 for me.

lanselambor commented 6 years ago

@jackdunger Thank you for dragging this bug out, I fixed this bug by adding functionality sim900_read_string_until, it will miss all content if using sim900_wait_for_resp for OK\r\n before read the response.

A new demo showing the effect: https://github.com/Seeed-Studio/GPRS_SIM900/tree/master/examples/GPRS_Show_Incoming_Call