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lib: nrf_modem: allow modem shutdown in flight mode #11590

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Jun 23, 2023
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lib: nrf_modem: allow modem shutdown in flight mode #11590

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4 changes: 4 additions & 0 deletions doc/nrf/releases/release-notes-changelog.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -333,6 +333,10 @@ Modem libraries

* Added the :ref:`modem_battery_readme` library that obtains battery voltage information or notifications from a modem.

* :ref:`nrf_modem_lib_readme`:

* Updated the :c:func:`nrf_modem_lib_shutdown` function to allow the modem to be in flight mode (``CFUN=4``) when shutting down the modem.

* :ref:`pdn_readme` library:

* Updated the library to allow a ``PDP_type``-only configuration in the :c:func:`pdn_ctx_configure` function.
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7 changes: 5 additions & 2 deletions lib/nrf_modem_lib/nrf_modem_lib.c
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Expand Up @@ -29,6 +29,7 @@ BUILD_ASSERT(IPC_IRQn == NRF_MODEM_IPC_IRQ, "NRF_MODEM_IPC_IRQ mismatch");

#define AT_CFUN_READ "AT+CFUN?"
#define AT_CFUN0_VAL 0
#define AT_CFUN4_VAL 4

/* The heap implementation in `nrf_modem_os.c` require some overhead
* to allow allocating up to `NRF_MODEM_LIB_SHMEM_TX_SIZE` bytes.
Expand Down Expand Up @@ -163,9 +164,11 @@ int nrf_modem_lib_shutdown(void)
e->callback(e->context);
}

/* The application must set CFUN=0 before calling nrf_modem_shutdown. */
/* The application must disable both transmit and receive RF circuits, and deactivate
* LTE and GNSS services, before calling nrf_modem_shutdown.
*/
ret = nrf_modem_at_scanf(AT_CFUN_READ, "+CFUN: %hu", &mode);
if (ret == 1 && mode != AT_CFUN0_VAL) {
if (ret == 1 && (mode != AT_CFUN0_VAL && mode != AT_CFUN4_VAL)) {
LOG_WRN("Application should set minimal functional mode (CFUN=0) before "
"shutting down modem library");
nrf_modem_at_printf("AT+CFUN=0");
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