blob: e2b36d19c316a1e3be17d5f74b4c01b661a8af05 [file] [log] [blame]
/*
* Copyright (c) 2022 Trackunit Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(modem_chat, CONFIG_MODEM_MODULES_LOG_LEVEL);
#include <zephyr/kernel.h>
#include <string.h>
#include <zephyr/modem/chat.h>
#define MODEM_CHAT_MATCHES_INDEX_RESPONSE (0)
#define MODEM_CHAT_MATCHES_INDEX_ABORT (1)
#define MODEM_CHAT_MATCHES_INDEX_UNSOL (2)
#define MODEM_CHAT_SCRIPT_STATE_RUNNING_BIT (0)
#if defined(CONFIG_LOG) && (CONFIG_MODEM_MODULES_LOG_LEVEL == LOG_LEVEL_DBG)
static char log_buffer[CONFIG_MODEM_CHAT_LOG_BUFFER_SIZE];
static void modem_chat_log_received_command(struct modem_chat *chat)
{
uint16_t log_buffer_pos = 0;
uint16_t argv_len;
for (uint16_t i = 0; i < chat->argc; i++) {
argv_len = (uint16_t)strlen(chat->argv[i]);
/* Validate argument fits in log buffer including termination */
if (sizeof(log_buffer) < (log_buffer_pos + argv_len + 1)) {
LOG_WRN("log buffer overrun");
break;
}
/* Copy argument and append space */
memcpy(&log_buffer[log_buffer_pos], chat->argv[i], argv_len);
log_buffer_pos += argv_len;
log_buffer[log_buffer_pos] = ' ';
log_buffer_pos++;
}
/* Terminate line after last argument, overwriting trailing space */
log_buffer_pos = log_buffer_pos == 0 ? log_buffer_pos : log_buffer_pos - 1;
log_buffer[log_buffer_pos] = '\0';
LOG_DBG("%s", log_buffer);
}
#else
static void modem_chat_log_received_command(struct modem_chat *chat)
{
}
#endif
static void modem_chat_script_stop(struct modem_chat *chat, enum modem_chat_script_result result)
{
if ((chat == NULL) || (chat->script == NULL)) {
return;
}
/* Handle result */
if (result == MODEM_CHAT_SCRIPT_RESULT_SUCCESS) {
LOG_DBG("%s: complete", chat->script->name);
} else if (result == MODEM_CHAT_SCRIPT_RESULT_ABORT) {
LOG_WRN("%s: aborted", chat->script->name);
} else {
LOG_WRN("%s: timed out", chat->script->name);
}
/* Call back with result */
if (chat->script->callback != NULL) {
chat->script->callback(chat, result, chat->user_data);
}
/* Clear parse_match in case it is stored in the script being stopped */
if ((chat->parse_match != NULL) &&
((chat->parse_match_type == MODEM_CHAT_MATCHES_INDEX_ABORT) ||
(chat->parse_match_type == MODEM_CHAT_MATCHES_INDEX_RESPONSE))) {
chat->parse_match = NULL;
chat->parse_match_len = 0;
}
/* Clear reference to script */
chat->script = NULL;
/* Clear response and abort commands */
chat->matches[MODEM_CHAT_MATCHES_INDEX_ABORT] = NULL;
chat->matches_size[MODEM_CHAT_MATCHES_INDEX_ABORT] = 0;
chat->matches[MODEM_CHAT_MATCHES_INDEX_RESPONSE] = NULL;
chat->matches_size[MODEM_CHAT_MATCHES_INDEX_RESPONSE] = 0;
/* Cancel work */
k_work_cancel_delayable(&chat->script_timeout_work);
k_work_cancel(&chat->script_send_work);
k_work_cancel_delayable(&chat->script_send_timeout_work);
/* Clear script running state */
atomic_clear_bit(&chat->script_state, MODEM_CHAT_SCRIPT_STATE_RUNNING_BIT);
/* Store result of script for script stoppted indication */
chat->script_result = result;
/* Indicate script stopped */
k_sem_give(&chat->script_stopped_sem);
}
static void modem_chat_set_script_send_state(struct modem_chat *chat,
enum modem_chat_script_send_state state)
{
chat->script_send_pos = 0;
chat->script_send_state = state;
}
static void modem_chat_script_send(struct modem_chat *chat)
{
modem_chat_set_script_send_state(chat, MODEM_CHAT_SCRIPT_SEND_STATE_REQUEST);
k_work_submit(&chat->script_send_work);
}
static void modem_chat_script_set_response_matches(struct modem_chat *chat)
{
const struct modem_chat_script_chat *script_chat =
&chat->script->script_chats[chat->script_chat_it];
chat->matches[MODEM_CHAT_MATCHES_INDEX_RESPONSE] = script_chat->response_matches;
chat->matches_size[MODEM_CHAT_MATCHES_INDEX_RESPONSE] = script_chat->response_matches_size;
}
static void modem_chat_script_clear_response_matches(struct modem_chat *chat)
{
chat->matches[MODEM_CHAT_MATCHES_INDEX_RESPONSE] = NULL;
chat->matches_size[MODEM_CHAT_MATCHES_INDEX_RESPONSE] = 0;
}
static void modem_chat_script_next(struct modem_chat *chat, bool initial)
{
const struct modem_chat_script_chat *script_chat;
/* Advance iterator if not initial */
if (initial == true) {
/* Reset iterator */
chat->script_chat_it = 0;
} else {
/* Advance iterator */
chat->script_chat_it++;
}
/* Check if end of script reached */
if (chat->script_chat_it == chat->script->script_chats_size) {
modem_chat_script_stop(chat, MODEM_CHAT_SCRIPT_RESULT_SUCCESS);
return;
}
LOG_DBG("%s: step: %u", chat->script->name, chat->script_chat_it);
script_chat = &chat->script->script_chats[chat->script_chat_it];
/* Check if request must be sent */
if (script_chat->request_size > 0) {
LOG_DBG("sending: %.*s", script_chat->request_size, script_chat->request);
modem_chat_script_clear_response_matches(chat);
modem_chat_script_send(chat);
} else {
modem_chat_script_set_response_matches(chat);
}
}
static void modem_chat_script_start(struct modem_chat *chat, const struct modem_chat_script *script)
{
/* Save script */
chat->script = script;
/* Set abort matches */
chat->matches[MODEM_CHAT_MATCHES_INDEX_ABORT] = script->abort_matches;
chat->matches_size[MODEM_CHAT_MATCHES_INDEX_ABORT] = script->abort_matches_size;
LOG_DBG("running script: %s", chat->script->name);
/* Set first script command */
modem_chat_script_next(chat, true);
/* Start timeout work if script started */
if (chat->script != NULL) {
k_work_schedule(&chat->script_timeout_work, K_SECONDS(chat->script->timeout));
}
}
static void modem_chat_script_run_handler(struct k_work *item)
{
struct modem_chat *chat = CONTAINER_OF(item, struct modem_chat, script_run_work);
/* Start script */
modem_chat_script_start(chat, chat->pending_script);
}
static void modem_chat_script_timeout_handler(struct k_work *item)
{
struct k_work_delayable *dwork = k_work_delayable_from_work(item);
struct modem_chat *chat = CONTAINER_OF(dwork, struct modem_chat, script_timeout_work);
/* Abort script */
modem_chat_script_stop(chat, MODEM_CHAT_SCRIPT_RESULT_TIMEOUT);
}
static void modem_chat_script_abort_handler(struct k_work *item)
{
struct modem_chat *chat = CONTAINER_OF(item, struct modem_chat, script_abort_work);
/* Validate script is currently running */
if (chat->script == NULL) {
return;
}
/* Abort script */
modem_chat_script_stop(chat, MODEM_CHAT_SCRIPT_RESULT_ABORT);
}
static bool modem_chat_script_chat_is_no_response(struct modem_chat *chat)
{
const struct modem_chat_script_chat *script_chat =
&chat->script->script_chats[chat->script_chat_it];
return (script_chat->response_matches_size == 0) ? true : false;
}
static uint16_t modem_chat_script_chat_get_send_timeout(struct modem_chat *chat)
{
const struct modem_chat_script_chat *script_chat =
&chat->script->script_chats[chat->script_chat_it];
return script_chat->timeout;
}
/* Returns true when request part has been sent */
static bool modem_chat_send_script_request_part(struct modem_chat *chat)
{
const struct modem_chat_script_chat *script_chat =
&chat->script->script_chats[chat->script_chat_it];
uint8_t *request_part;
uint16_t request_size;
uint16_t request_part_size;
int ret;
switch (chat->script_send_state) {
case MODEM_CHAT_SCRIPT_SEND_STATE_REQUEST:
request_part = (uint8_t *)(&script_chat->request[chat->script_send_pos]);
request_size = script_chat->request_size;
break;
case MODEM_CHAT_SCRIPT_SEND_STATE_DELIMITER:
request_part = (uint8_t *)(&chat->delimiter[chat->script_send_pos]);
request_size = chat->delimiter_size;
break;
default:
return false;
}
request_part_size = request_size - chat->script_send_pos;
ret = modem_pipe_transmit(chat->pipe, request_part, request_part_size);
if (ret < 1) {
return false;
}
chat->script_send_pos += (uint16_t)ret;
/* Return true if all data was sent */
return request_size <= chat->script_send_pos;
}
static void modem_chat_script_send_handler(struct k_work *item)
{
struct modem_chat *chat = CONTAINER_OF(item, struct modem_chat, script_send_work);
uint16_t timeout;
if (chat->script == NULL) {
return;
}
switch (chat->script_send_state) {
case MODEM_CHAT_SCRIPT_SEND_STATE_IDLE:
return;
case MODEM_CHAT_SCRIPT_SEND_STATE_REQUEST:
if (!modem_chat_send_script_request_part(chat)) {
return;
}
modem_chat_set_script_send_state(chat, MODEM_CHAT_SCRIPT_SEND_STATE_DELIMITER);
__fallthrough;
case MODEM_CHAT_SCRIPT_SEND_STATE_DELIMITER:
if (!modem_chat_send_script_request_part(chat)) {
return;
}
modem_chat_set_script_send_state(chat, MODEM_CHAT_SCRIPT_SEND_STATE_IDLE);
break;
}
if (modem_chat_script_chat_is_no_response(chat)) {
timeout = modem_chat_script_chat_get_send_timeout(chat);
if (timeout == 0) {
modem_chat_script_next(chat, false);
} else {
k_work_schedule(&chat->script_send_timeout_work, K_MSEC(timeout));
}
} else {
modem_chat_script_set_response_matches(chat);
}
}
static void modem_chat_script_send_timeout_handler(struct k_work *item)
{
struct k_work_delayable *dwork = k_work_delayable_from_work(item);
struct modem_chat *chat = CONTAINER_OF(dwork, struct modem_chat, script_send_timeout_work);
/* Validate script is currently running */
if (chat->script == NULL) {
return;
}
modem_chat_script_next(chat, false);
}
static void modem_chat_parse_reset(struct modem_chat *chat)
{
/* Reset parameters used for parsing */
chat->receive_buf_len = 0;
chat->delimiter_match_len = 0;
chat->argc = 0;
chat->parse_match = NULL;
}
/* Exact match is stored at end of receive buffer */
static void modem_chat_parse_save_match(struct modem_chat *chat)
{
uint8_t *argv;
/* Store length of match including NULL to avoid overwriting it if buffer overruns */
chat->parse_match_len = chat->receive_buf_len + 1;
/* Copy match to end of receive buffer */
argv = &chat->receive_buf[chat->receive_buf_size - chat->parse_match_len];
/* Copy match to end of receive buffer (excluding NULL) */
memcpy(argv, &chat->receive_buf[0], chat->parse_match_len - 1);
/* Save match */
chat->argv[chat->argc] = argv;
/* Terminate match */
chat->receive_buf[chat->receive_buf_size - 1] = '\0';
/* Increment argument count */
chat->argc++;
}
static bool modem_chat_match_matches_received(struct modem_chat *chat,
const struct modem_chat_match *match)
{
for (uint16_t i = 0; i < match->match_size; i++) {
if ((match->match[i] == chat->receive_buf[i]) ||
(match->wildcards == true && match->match[i] == '?')) {
continue;
}
return false;
}
return true;
}
static bool modem_chat_parse_find_match(struct modem_chat *chat)
{
/* Find in all matches types */
for (uint16_t i = 0; i < ARRAY_SIZE(chat->matches); i++) {
/* Find in all matches of matches type */
for (uint16_t u = 0; u < chat->matches_size[i]; u++) {
/* Validate match size matches received data length */
if (chat->matches[i][u].match_size != chat->receive_buf_len) {
continue;
}
/* Validate match */
if (modem_chat_match_matches_received(chat, &chat->matches[i][u]) ==
false) {
continue;
}
/* Complete match found */
chat->parse_match = &chat->matches[i][u];
chat->parse_match_type = i;
return true;
}
}
return false;
}
static bool modem_chat_parse_is_separator(struct modem_chat *chat)
{
for (uint16_t i = 0; i < chat->parse_match->separators_size; i++) {
if ((chat->parse_match->separators[i]) ==
(chat->receive_buf[chat->receive_buf_len - 1])) {
return true;
}
}
return false;
}
static bool modem_chat_parse_end_del_start(struct modem_chat *chat)
{
for (uint8_t i = 0; i < chat->delimiter_size; i++) {
if (chat->receive_buf[chat->receive_buf_len - 1] == chat->delimiter[i]) {
return true;
}
}
return false;
}
static bool modem_chat_parse_end_del_complete(struct modem_chat *chat)
{
/* Validate length of end delimiter */
if (chat->receive_buf_len < chat->delimiter_size) {
return false;
}
/* Compare end delimiter with receive buffer content */
return (memcmp(&chat->receive_buf[chat->receive_buf_len - chat->delimiter_size],
chat->delimiter, chat->delimiter_size) == 0)
? true
: false;
}
static void modem_chat_on_command_received_unsol(struct modem_chat *chat)
{
/* Callback */
if (chat->parse_match->callback != NULL) {
chat->parse_match->callback(chat, (char **)chat->argv, chat->argc, chat->user_data);
}
}
static void modem_chat_on_command_received_abort(struct modem_chat *chat)
{
/* Callback */
if (chat->parse_match->callback != NULL) {
chat->parse_match->callback(chat, (char **)chat->argv, chat->argc, chat->user_data);
}
/* Abort script */
modem_chat_script_stop(chat, MODEM_CHAT_SCRIPT_RESULT_ABORT);
}
static void modem_chat_on_command_received_resp(struct modem_chat *chat)
{
/* Callback */
if (chat->parse_match->callback != NULL) {
chat->parse_match->callback(chat, (char **)chat->argv, chat->argc, chat->user_data);
}
/* Validate response command is not partial */
if (chat->parse_match->partial) {
return;
}
/* Advance script */
modem_chat_script_next(chat, false);
}
static bool modem_chat_parse_find_catch_all_match(struct modem_chat *chat)
{
/* Find in all matches types */
for (uint16_t i = 0; i < ARRAY_SIZE(chat->matches); i++) {
/* Find in all matches of matches type */
for (uint16_t u = 0; u < chat->matches_size[i]; u++) {
/* Validate match config is matching previous bytes */
if (chat->matches[i][u].match_size == 0) {
chat->parse_match = &chat->matches[i][u];
chat->parse_match_type = i;
return true;
}
}
}
return false;
}
static void modem_chat_on_command_received(struct modem_chat *chat)
{
modem_chat_log_received_command(chat);
switch (chat->parse_match_type) {
case MODEM_CHAT_MATCHES_INDEX_UNSOL:
modem_chat_on_command_received_unsol(chat);
break;
case MODEM_CHAT_MATCHES_INDEX_ABORT:
modem_chat_on_command_received_abort(chat);
break;
case MODEM_CHAT_MATCHES_INDEX_RESPONSE:
modem_chat_on_command_received_resp(chat);
break;
}
}
static void modem_chat_on_unknown_command_received(struct modem_chat *chat)
{
/* Terminate received command */
chat->receive_buf[chat->receive_buf_len - chat->delimiter_size] = '\0';
/* Try to find catch all match */
if (modem_chat_parse_find_catch_all_match(chat) == false) {
LOG_DBG("%s", chat->receive_buf);
return;
}
/* Parse command */
chat->argv[0] = "";
chat->argv[1] = chat->receive_buf;
chat->argc = 2;
modem_chat_on_command_received(chat);
}
static void modem_chat_process_byte(struct modem_chat *chat, uint8_t byte)
{
/* Validate receive buffer not overrun */
if (chat->receive_buf_size == chat->receive_buf_len) {
LOG_WRN("receive buffer overrun");
modem_chat_parse_reset(chat);
return;
}
/* Validate argv buffer not overrun */
if (chat->argc == chat->argv_size) {
LOG_WRN("argv buffer overrun");
modem_chat_parse_reset(chat);
return;
}
/* Copy byte to receive buffer */
chat->receive_buf[chat->receive_buf_len] = byte;
chat->receive_buf_len++;
/* Validate end delimiter not complete */
if (modem_chat_parse_end_del_complete(chat) == true) {
/* Filter out empty lines */
if (chat->receive_buf_len == chat->delimiter_size) {
/* Reset parser */
modem_chat_parse_reset(chat);
return;
}
/* Check if match exists */
if (chat->parse_match == NULL) {
/* Handle unknown command */
modem_chat_on_unknown_command_received(chat);
/* Reset parser */
modem_chat_parse_reset(chat);
return;
}
/* Check if trailing argument exists */
if (chat->parse_arg_len > 0) {
chat->argv[chat->argc] =
&chat->receive_buf[chat->receive_buf_len - chat->delimiter_size -
chat->parse_arg_len];
chat->receive_buf[chat->receive_buf_len - chat->delimiter_size] = '\0';
chat->argc++;
}
/* Handle received command */
modem_chat_on_command_received(chat);
/* Reset parser */
modem_chat_parse_reset(chat);
return;
}
/* Validate end delimiter not started */
if (modem_chat_parse_end_del_start(chat) == true) {
return;
}
/* Find matching command if missing */
if (chat->parse_match == NULL) {
/* Find matching command */
if (modem_chat_parse_find_match(chat) == false) {
return;
}
/* Save match */
modem_chat_parse_save_match(chat);
/* Prepare argument parser */
chat->parse_arg_len = 0;
return;
}
/* Check if separator reached */
if (modem_chat_parse_is_separator(chat) == true) {
/* Check if argument is empty */
if (chat->parse_arg_len == 0) {
/* Save empty argument */
chat->argv[chat->argc] = "";
} else {
/* Save pointer to start of argument */
chat->argv[chat->argc] =
&chat->receive_buf[chat->receive_buf_len - chat->parse_arg_len - 1];
/* Replace separator with string terminator */
chat->receive_buf[chat->receive_buf_len - 1] = '\0';
}
/* Increment argument count */
chat->argc++;
/* Reset parse argument length */
chat->parse_arg_len = 0;
return;
}
/* Increment argument length */
chat->parse_arg_len++;
}
static bool modem_chat_discard_byte(struct modem_chat *chat, uint8_t byte)
{
for (uint8_t i = 0; i < chat->filter_size; i++) {
if (byte == chat->filter[i]) {
return true;
}
}
return false;
}
/* Process chunk of received bytes */
static void modem_chat_process_bytes(struct modem_chat *chat)
{
for (uint16_t i = 0; i < chat->work_buf_len; i++) {
if (modem_chat_discard_byte(chat, chat->work_buf[i])) {
continue;
}
modem_chat_process_byte(chat, chat->work_buf[i]);
}
}
static void modem_chat_process_handler(struct k_work *item)
{
struct modem_chat *chat = CONTAINER_OF(item, struct modem_chat, receive_work);
int ret;
/* Fill work buffer */
ret = modem_pipe_receive(chat->pipe, chat->work_buf, sizeof(chat->work_buf));
if (ret < 1) {
return;
}
/* Save received data length */
chat->work_buf_len = (size_t)ret;
/* Process data */
modem_chat_process_bytes(chat);
k_work_submit(&chat->receive_work);
}
static void modem_chat_pipe_callback(struct modem_pipe *pipe, enum modem_pipe_event event,
void *user_data)
{
struct modem_chat *chat = (struct modem_chat *)user_data;
switch (event) {
case MODEM_PIPE_EVENT_RECEIVE_READY:
k_work_submit(&chat->receive_work);
break;
case MODEM_PIPE_EVENT_TRANSMIT_IDLE:
k_work_submit(&chat->script_send_work);
break;
default:
break;
}
}
int modem_chat_init(struct modem_chat *chat, const struct modem_chat_config *config)
{
__ASSERT_NO_MSG(chat != NULL);
__ASSERT_NO_MSG(config != NULL);
__ASSERT_NO_MSG(config->receive_buf != NULL);
__ASSERT_NO_MSG(config->receive_buf_size > 0);
__ASSERT_NO_MSG(config->argv != NULL);
__ASSERT_NO_MSG(config->argv_size > 0);
__ASSERT_NO_MSG(config->delimiter != NULL);
__ASSERT_NO_MSG(config->delimiter_size > 0);
__ASSERT_NO_MSG(!((config->filter == NULL) && (config->filter_size > 0)));
__ASSERT_NO_MSG(!((config->unsol_matches == NULL) && (config->unsol_matches_size > 0)));
memset(chat, 0x00, sizeof(*chat));
chat->pipe = NULL;
chat->user_data = config->user_data;
chat->receive_buf = config->receive_buf;
chat->receive_buf_size = config->receive_buf_size;
chat->argv = config->argv;
chat->argv_size = config->argv_size;
chat->delimiter = config->delimiter;
chat->delimiter_size = config->delimiter_size;
chat->filter = config->filter;
chat->filter_size = config->filter_size;
chat->matches[MODEM_CHAT_MATCHES_INDEX_UNSOL] = config->unsol_matches;
chat->matches_size[MODEM_CHAT_MATCHES_INDEX_UNSOL] = config->unsol_matches_size;
atomic_set(&chat->script_state, 0);
k_sem_init(&chat->script_stopped_sem, 0, 1);
k_work_init(&chat->receive_work, modem_chat_process_handler);
k_work_init(&chat->script_run_work, modem_chat_script_run_handler);
k_work_init_delayable(&chat->script_timeout_work, modem_chat_script_timeout_handler);
k_work_init(&chat->script_abort_work, modem_chat_script_abort_handler);
k_work_init(&chat->script_send_work, modem_chat_script_send_handler);
k_work_init_delayable(&chat->script_send_timeout_work,
modem_chat_script_send_timeout_handler);
return 0;
}
int modem_chat_attach(struct modem_chat *chat, struct modem_pipe *pipe)
{
chat->pipe = pipe;
modem_chat_parse_reset(chat);
modem_pipe_attach(chat->pipe, modem_chat_pipe_callback, chat);
return 0;
}
int modem_chat_run_script_async(struct modem_chat *chat, const struct modem_chat_script *script)
{
bool script_is_running;
if (chat->pipe == NULL) {
return -EPERM;
}
/* Validate script */
if ((script->script_chats == NULL) || (script->script_chats_size == 0) ||
((script->abort_matches != NULL) && (script->abort_matches_size == 0))) {
return -EINVAL;
}
/* Validate script commands */
for (uint16_t i = 0; i < script->script_chats_size; i++) {
if ((script->script_chats[i].request_size == 0) &&
(script->script_chats[i].response_matches_size == 0)) {
return -EINVAL;
}
}
script_is_running =
atomic_test_and_set_bit(&chat->script_state, MODEM_CHAT_SCRIPT_STATE_RUNNING_BIT);
if (script_is_running == true) {
return -EBUSY;
}
chat->pending_script = script;
k_work_submit(&chat->script_run_work);
return 0;
}
int modem_chat_run_script(struct modem_chat *chat, const struct modem_chat_script *script)
{
int ret;
k_sem_reset(&chat->script_stopped_sem);
ret = modem_chat_run_script_async(chat, script);
if (ret < 0) {
return ret;
}
ret = k_sem_take(&chat->script_stopped_sem, K_FOREVER);
if (ret < 0) {
return ret;
}
return chat->script_result == MODEM_CHAT_SCRIPT_RESULT_SUCCESS ? 0 : -EAGAIN;
}
void modem_chat_script_abort(struct modem_chat *chat)
{
k_work_submit(&chat->script_abort_work);
}
void modem_chat_release(struct modem_chat *chat)
{
struct k_work_sync sync;
if (chat->pipe) {
modem_pipe_release(chat->pipe);
}
k_work_cancel_sync(&chat->script_run_work, &sync);
k_work_cancel_sync(&chat->script_abort_work, &sync);
k_work_cancel_sync(&chat->receive_work, &sync);
k_work_cancel_sync(&chat->script_send_work, &sync);
chat->pipe = NULL;
chat->receive_buf_len = 0;
chat->work_buf_len = 0;
chat->argc = 0;
chat->script = NULL;
chat->script_chat_it = 0;
atomic_set(&chat->script_state, 0);
chat->script_result = MODEM_CHAT_SCRIPT_RESULT_ABORT;
k_sem_reset(&chat->script_stopped_sem);
chat->script_send_state = MODEM_CHAT_SCRIPT_SEND_STATE_IDLE;
chat->script_send_pos = 0;
chat->parse_match = NULL;
chat->parse_match_len = 0;
chat->parse_arg_len = 0;
chat->matches[MODEM_CHAT_MATCHES_INDEX_ABORT] = NULL;
chat->matches_size[MODEM_CHAT_MATCHES_INDEX_ABORT] = 0;
chat->matches[MODEM_CHAT_MATCHES_INDEX_RESPONSE] = NULL;
chat->matches_size[MODEM_CHAT_MATCHES_INDEX_RESPONSE] = 0;
}