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net: lwm2m: Add data validation callback

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Add a data validation callback to the resource structure, which can be
registered by an application. It allows to verify the data before
actually modifying the resource data.

If the callback is registered for a resource, the data is decoded into a
temporary buffer first, and only copied into the actual resource buffer
if the validation is successfull. If no validation is required (and thus
no callback registered) the resource value is decoded directly into the
resource buffer, as it used to be.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
This commit is contained in:
Robert Lubos 2021-02-17 15:47:28 +01:00 • committed by Anas Nashif
commit 31e5ec79b8
16 changed files with 192 additions and 59 deletions
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2
subsys/net/lib/lwm2m/ipso_buzzer.c
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@ -216,7 +216,7 @@ static struct lwm2m_engine_obj_inst *buzzer_create(uint16_t obj_inst_id)
res_inst[avail], j, 1, false, true,
&buzzer_data[avail].onoff,
sizeof(buzzer_data[avail].onoff),
NULL, NULL, onoff_post_write_cb, NULL);
NULL, NULL, NULL, onoff_post_write_cb, NULL);
INIT_OBJ_RES_DATA(BUZZER_LEVEL_ID, res[avail], i, res_inst[avail], j,
&buzzer_data[avail].level,
sizeof(buzzer_data[avail].level));