Fetch LwM2M related updates from upstream

include/zephyr/net/coap.h

@@ -269,7 +269,7 @@ typedef int (*coap_reply_t)(const struct coap_packet *response,
  */
 struct coap_pending {
 	struct sockaddr addr;
-	uint32_t t0;
+	int64_t t0;
 	uint32_t timeout;
 	uint16_t id;
 	uint8_t *data;

include/zephyr/net/lwm2m.h

@@ -1911,21 +1911,6 @@ int lwm2m_engine_delete_res_inst(const char *pathstr);
  */
 int lwm2m_delete_res_inst(const struct lwm2m_obj_path *path);
 
-/**
- * @brief Update the period of a given service.
- *
- * Allow the period modification on an existing service created with
- * lwm2m_engine_add_service().
- * Example to frequency at which a periodic_service changes it's values :
- * lwm2m_engine_update_service(device_periodic_service,5*MSEC_PER_SEC);
- *
- * @param[in] service Handler of the periodic_service
- * @param[in] period_ms New period for the periodic_service (in milliseconds)
- *
- * @return 0 for success or negative in case of error.
- */
-int lwm2m_engine_update_service_period(k_work_handler_t service, uint32_t period_ms);
-
 /**
  * @brief Update the period of the device service.
  *

samples/net/lwm2m_client/README.rst

@@ -52,6 +52,9 @@ samples/net/lwm2m_client directory:
 - :file:`overlay-queue.conf`
   This overlay config can be added to enable LWM2M Queue Mode support.
 
+- :file:`overlay-tickless.conf`
+   This overlay config can be used to stop LwM2M engine for periodically interrupting socket polls. It can have significant effect on power usage on certain devices.
+
 Build the lwm2m-client sample application like this:
 
 .. zephyr-app-commands::

samples/net/lwm2m_client/overlay-tickless.conf

@@ -0,0 +1,2 @@
+CONFIG_NET_SOCKETPAIR=y
+CONFIG_LWM2M_TICKLESS=y

samples/net/sockets/coap_server/src/coap-server.c

@@ -954,8 +954,8 @@ static int large_create_post(struct coap_resource *resource,
 static void schedule_next_retransmission(void)
 {
 	struct coap_pending *pending;
-	int32_t remaining;
-	uint32_t now = k_uptime_get_32();
+	int64_t remaining;
+	int64_t now = k_uptime_get();
 
 	/* Get the first pending retransmission to expire after cycling. */
 	pending = coap_pending_next_to_expire(pendings, NUM_PENDINGS);

subsys/net/lib/coap/coap.c

@@ -1287,7 +1287,7 @@ int coap_pending_init(struct coap_pending *pending,
 
 	pending->data = request->data;
 	pending->len = request->offset;
-	pending->t0 = k_uptime_get_32();
+	pending->t0 = k_uptime_get();
 	pending->retries = retries;
 
 	return 0;
@@ -1382,7 +1382,7 @@ struct coap_pending *coap_pending_next_to_expire(
 {
 	struct coap_pending *p, *found = NULL;
 	size_t i;
-	uint32_t expiry, min_expiry;
+	int64_t expiry, min_expiry = INT64_MAX;
 
 	for (i = 0, p = pendings; i < len; i++, p++) {
 		if (!p->timeout) {
@@ -1391,7 +1391,7 @@ struct coap_pending *coap_pending_next_to_expire(
 
 		expiry = p->t0 + p->timeout;
 
-		if (!found || (int32_t)(expiry - min_expiry) < 0) {
+		if (expiry < min_expiry) {
 			min_expiry = expiry;
 			found = p;
 		}

subsys/net/lib/lwm2m/Kconfig

@@ -77,6 +77,20 @@ config LWM2M_DNS_SUPPORT
 	bool "DNS support in the LWM2M client"
 	default y if DNS_RESOLVER
 
+choice
+	prompt "LwM2M Engine operation mode"
+	default LWM2M_TICKLESS if NET_SOCKETPAIR
+	default LWM2M_INTERVAL if !NET_SOCKETPAIR
+
+config LWM2M_TICKLESS
+	bool "Tickless operation mode"
+	depends on NET_SOCKETPAIR
+
+config LWM2M_INTERVAL
+	bool "Interval based polling mode"
+
+endchoice
+
 config LWM2M_ENGINE_STACK_SIZE
 	int "LWM2M engine stack size"
 	default 2560 if NET_LOG