modem: chat: Add helpers and test for dynamic chat scripts

This commit adds helpers for initializing all aspects of a
chat script at runtime.

Signed-off-by: Bjarki Arge Andreasen <bjarkix123@gmail.com>

include/zephyr/modem/chat.h

@@ -295,6 +295,33 @@ int modem_chat_init(struct modem_chat *chat, const struct modem_chat_config *con
  */
 int modem_chat_attach(struct modem_chat *chat, struct modem_pipe *pipe);
 
+/**
+ * @brief Initialize chat match structure
+ * @param chat_match Chat match structure to initialize
+ */
+void modem_chat_match_init(struct modem_chat_match *chat_match, const char *match,
+			   const char *separators, bool wildcards, bool partial,
+			   modem_chat_match_callback callback);
+
+/**
+ * @brief Initialize chat script chat structure
+ * @param script_chat Chat script chat structure to initialize
+ */
+void modem_chat_script_chat_init(struct modem_chat_script_chat *script_chat, const char *request,
+				 const struct modem_chat_match *response_matches,
+				 uint16_t response_matches_size, uint16_t timeout_ms);
+
+/**
+ * @brief Initialize chat script structure
+ * @param chat_match Chat script  structure to initialize
+ */
+void modem_chat_script_init(struct modem_chat_script *script, const char *name,
+			    const struct modem_chat_script_chat *script_chats,
+			    uint16_t script_chats_size,
+			    const struct modem_chat_match *abort_matches,
+			    uint16_t abort_matches_size,
+			    modem_chat_script_callback callback, uint32_t timeout);
+
 /**
  * @brief Run script asynchronously
  * @param chat Chat instance

subsys/modem/modem_chat.c

@@ -734,6 +734,45 @@ int modem_chat_attach(struct modem_chat *chat, struct modem_pipe *pipe)
 	return 0;
 }
 
+void modem_chat_match_init(struct modem_chat_match *chat_match, const char *match,
+			   const char *separators, bool wildcards, bool partial,
+			   modem_chat_match_callback callback)
+{
+	chat_match->match = match;
+	chat_match->match_size = strlen(match);
+	chat_match->separators = separators;
+	chat_match->separators_size = strlen(separators);
+	chat_match->wildcards = wildcards;
+	chat_match->partial = partial;
+	chat_match->callback = callback;
+}
+
+void modem_chat_script_chat_init(struct modem_chat_script_chat *script_chat, const char *request,
+				 const struct modem_chat_match *response_matches,
+				 uint16_t response_matches_size, uint16_t timeout_ms)
+{
+	script_chat->request = request;
+	script_chat->response_matches = response_matches;
+	script_chat->response_matches_size = response_matches_size;
+	script_chat->timeout = timeout_ms;
+}
+
+void modem_chat_script_init(struct modem_chat_script *script, const char *name,
+			    const struct modem_chat_script_chat *script_chats,
+			    uint16_t script_chats_size,
+			    const struct modem_chat_match *abort_matches,
+			    uint16_t abort_matches_size,
+			    modem_chat_script_callback callback, uint32_t timeout)
+{
+	script->name = name;
+	script->script_chats = script_chats;
+	script->script_chats_size = script_chats_size;
+	script->abort_matches = abort_matches;
+	script->abort_matches_size = abort_matches_size;
+	script->callback = callback;
+	script->timeout = timeout;
+}
+
 int modem_chat_run_script_async(struct modem_chat *chat, const struct modem_chat_script *script)
 {
 	bool script_is_running;

tests/subsys/modem/modem_chat/src/main.c

@@ -566,6 +566,25 @@ ZTEST(modem_chat, test_script_run_sync_abort)
 		      "Echo script should time out and return -EAGAIN");
 }
 
+ZTEST(modem_chat, test_script_run_dynamic_script_sync)
+{
+	char match[] = "AT";
+	char separators[] = ",";
+	char request[] = "AT";
+	char name[] = "Dynamic";
+
+	struct modem_chat_match stack_response_match;
+	struct modem_chat_script_chat stack_script_chat;
+	struct modem_chat_script stack_script;
+
+	modem_chat_match_init(&stack_response_match, match, separators, false, false, NULL);
+	modem_chat_script_chat_init(&stack_script_chat, request, &stack_response_match, 1, 0);
+	modem_chat_script_init(&stack_script, name, &stack_script_chat, 1, NULL, 0, NULL, 1);
+
+	modem_backend_mock_prime(&mock, &at_echo_transaction);
+	zassert_ok(modem_chat_run_script(&cmd, &stack_script), "Failed to run script");
+}
+
 /*************************************************************************************************/
 /*                                         Test suite                                            */
 /*************************************************************************************************/