diff options
Diffstat (limited to 'fw/esp32/components/eos/cell_modem.c')
| -rw-r--r-- | fw/esp32/components/eos/cell_modem.c | 767 |
1 files changed, 767 insertions, 0 deletions
diff --git a/fw/esp32/components/eos/cell_modem.c b/fw/esp32/components/eos/cell_modem.c new file mode 100644 index 0000000..c6d718f --- /dev/null +++ b/fw/esp32/components/eos/cell_modem.c @@ -0,0 +1,767 @@ +#include <stdlib.h> +#include <string.h> + +#include <freertos/FreeRTOS.h> +#include <freertos/semphr.h> +#include <freertos/task.h> +#include <freertos/queue.h> +#include <netif/ppp/pppos.h> +#include <netif/ppp/pppapi.h> +#include <driver/uart.h> +#include <driver/gpio.h> +#include <esp_sleep.h> +#include <esp_log.h> + +#include "eos.h" +#include "net.h" +#include "power.h" + +#include "at_cmd.h" +#include "cell.h" + +// XXX: PPP reconnect on failure + +#define UART_SIZE_IO_BUF 1024 + +#define UART_GPIO_TXD 16 +#define UART_GPIO_RXD 17 +#define UART_GPIO_DTR 32 +#define UART_GPIO_RI 35 + +#define MODEM_ETYPE_INIT 1 +#define MODEM_ETYPE_RI 2 + +#define AT_CMD_INIT_SIZE 3 + +#define MIN(X, Y) (((X) < (Y)) ? (X) : (Y)) +#define MAX(X, Y) (((X) > (Y)) ? (X) : (Y)) + +static const char *TAG = "EOS MODEM"; + +static char *at_cmd_init[AT_CMD_INIT_SIZE] = { + "AT+CFGRI=1\r", + "AT+CSCLK=1\r", + "AT+CMGF=0\r" +}; + +static SemaphoreHandle_t mutex; + +static QueueHandle_t modem_queue; +static QueueHandle_t uart_queue; + +static char urc_buf[EOS_CELL_UART_SIZE_BUF]; +static char uart_buf[EOS_CELL_UART_SIZE_BUF]; +static size_t uart_buf_len; + +static uint8_t uart_mode = EOS_CELL_UART_MODE_ATCMD; +static SemaphoreHandle_t uart_mutex; + +static char ppp_apn[64]; +static char ppp_user[64]; +static char ppp_pass[64]; +static SemaphoreHandle_t ppp_mutex; + +static ppp_pcb *ppp_handle; +static struct netif ppp_netif; + +typedef enum { + UART_EEVT_MODE = UART_EVENT_MAX +} uart_eevt_type_t; + +typedef struct { + uint8_t type; +} modem_event_t; + +static void modem_atcmd_read(size_t bsize); + +static void uart_data_read(uint8_t mode) { + unsigned char *buf; + int rd; + size_t bsize; + + uart_get_buffered_data_len(UART_NUM_2, &bsize); + switch (mode) { + case EOS_CELL_UART_MODE_ATCMD: + modem_atcmd_read(bsize); + break; + + case EOS_CELL_UART_MODE_PPP: + rd = 0; + + do { + int _rd = eos_modem_read(uart_buf, MIN(bsize - rd, sizeof(uart_buf)), 100); + pppos_input_tcpip(ppp_handle, (uint8_t *)uart_buf, _rd); + rd += _rd; + } while (rd != bsize); + break; + + case EOS_CELL_UART_MODE_RELAY: + rd = 0; + + do { + int _rd; + + buf = eos_net_alloc(); + buf[0] = EOS_CELL_MTYPE_UART_DATA; + _rd = eos_modem_read(buf + 1, MIN(bsize - rd, EOS_NET_SIZE_BUF - 1), 100); + eos_net_send(EOS_NET_MTYPE_CELL, buf, _rd + 1, 0); + rd += _rd; + } while (rd != bsize); + break; + + default: + break; + + } +} + +static void uart_event_task(void *pvParameters) { + char mode = EOS_CELL_UART_MODE_ATCMD; + char _mode = EOS_CELL_UART_MODE_ATCMD; + uart_event_t event; + + xSemaphoreTake(uart_mutex, portMAX_DELAY); + while (1) { + /* Waiting for UART event. + */ + if (xQueueReceive(uart_queue, &event, portMAX_DELAY)) { + switch (event.type) { + case UART_DATA: + /* Event of UART receiving data + */ + if (mode != EOS_CELL_UART_MODE_NONE) uart_data_read(mode); + if ((mode != _mode) && (uart_buf_len == 0)) { + if (_mode == EOS_CELL_UART_MODE_NONE) xSemaphoreGive(uart_mutex); + mode = _mode; + } + break; + + case UART_EEVT_MODE: + /* Mode change + */ + _mode = (char)event.size; + if ((_mode != mode) && ((uart_buf_len == 0) || (mode == EOS_CELL_UART_MODE_NONE))) { + if (mode == EOS_CELL_UART_MODE_NONE) { + xSemaphoreTake(uart_mutex, portMAX_DELAY); + uart_data_read(_mode); + } + if (_mode == EOS_CELL_UART_MODE_NONE) xSemaphoreGive(uart_mutex); + mode = _mode; + } + break; + + default: + break; + } + } + } + vTaskDelete(NULL); +} + +static void IRAM_ATTR uart_ri_isr_handler(void *arg) { + modem_event_t evt; + + evt.type = MODEM_ETYPE_RI; + xQueueSendFromISR(modem_queue, &evt, NULL); +} + +static int modem_atcmd_init(void) { + unsigned char *buf; + int echo_on = 0; + int tries = 3; + int i, r; + int rv = EOS_OK; + + rv = eos_modem_take(1000); + if (rv) return rv; + + do { + at_cmd("AT\r"); + r = at_expect("^AT", "^OK", 1000); + if (r >= 0) { + echo_on = r; + if (echo_on) { + r = at_expect("^OK", NULL, 1000); + } + break; + } + tries--; + } while (tries); + + if (tries == 0) { + eos_modem_give(); + return EOS_ERR_TIMEOUT; + } + + if (echo_on) { + at_cmd("AT&F\r"); + r = at_expect("^AT&F", NULL, 1000); + r = at_expect("^OK", NULL, 1000); + } else { + at_cmd("AT&F\r"); + r = at_expect("^OK", NULL, 1000); + + } + at_cmd("ATE0\r"); + r = at_expect("^ATE0", NULL, 1000); + r = at_expect("^OK", "^ERROR", 1000); + + for (i=0; i<AT_CMD_INIT_SIZE; i++) { + at_cmd(at_cmd_init[i]); + r = at_expect("^OK", "^ERROR", 1000); + } + + buf = eos_net_alloc(); + buf[0] = EOS_CELL_MTYPE_READY; + eos_net_send(EOS_NET_MTYPE_CELL, buf, 1, 0); + + eos_modem_give(); + + return EOS_OK; +} + +static void modem_atcmd_read(size_t bsize) { + char *ln_end; + int rd = 0; + + do { + char *uart_curr = uart_buf + uart_buf_len; + int _rd = eos_modem_read(uart_curr, MIN(bsize - rd, sizeof(uart_buf) - uart_buf_len - 1), 100); + + rd += _rd; + uart_buf_len += _rd; + uart_buf[uart_buf_len] = '\0'; + while ((ln_end = strchr(uart_curr, '\n'))) { + size_t urc_buf_len = ln_end - uart_buf; + + if ((ln_end > uart_buf) && (*(ln_end - 1) == '\r')) urc_buf_len--; + memcpy(urc_buf, uart_buf, urc_buf_len); + urc_buf[urc_buf_len] = '\0'; + + uart_buf_len -= ln_end - uart_buf + 1; + if (uart_buf_len) memmove(uart_buf, ln_end + 1, uart_buf_len); + uart_curr = uart_buf; + uart_buf[uart_buf_len] = '\0'; + + at_urc_process(urc_buf); + } + if (uart_buf_len == sizeof(uart_buf) - 1) { + uart_buf_len = 0; + memcpy(urc_buf, uart_buf, sizeof(urc_buf)); + at_urc_process(urc_buf); + } + } while (rd != bsize); +} + +int modem_urc_init_handler(char *urc, regmatch_t *m) { + modem_event_t evt; + + evt.type = MODEM_ETYPE_INIT; + xQueueSend(modem_queue, &evt, portMAX_DELAY); + + return AT_URC_OK; +} + +static void modem_set_mode(uint8_t mode) { + uart_event_t evt; + + evt.type = UART_EEVT_MODE; + evt.size = mode; + xQueueSend(uart_queue, &evt, portMAX_DELAY); +} + +static void modem_event_task(void *pvParameters) { + modem_event_t evt; + + while (1) { + if (xQueueReceive(modem_queue, &evt, portMAX_DELAY)) { + switch (evt.type) { + case MODEM_ETYPE_INIT: + modem_atcmd_init(); + break; + + case MODEM_ETYPE_RI: + ESP_LOGI(TAG, "URC from RI"); + break; + + default: + break; + } + + /* Obsolete!!! + uint64_t t_start = esp_timer_get_time(); + if (xQueueReceive(modem_queue, &level, 200 / portTICK_RATE_MS) && (level == 1)) { + uint64_t t_end = esp_timer_get_time(); + ESP_LOGI(TAG, "URC:%u", (uint32_t)(t_end - t_start)); + } else { + ESP_LOGI(TAG, "RING"); + } + */ + + } + } + vTaskDelete(NULL); +} + +static char *memstr(char *mem, size_t size, char *str) { + size_t i = 0; + char *max_mem; + + if (str[0] == '\0') return NULL; + + max_mem = mem + size; + + while (mem < max_mem) { + if (*mem != str[i]) { + mem -= i; + i = 0; + } else { + if (str[i+1] == '\0') return mem - i; + i++; + } + mem++; + } + + return NULL; +} + +static uint32_t ppp_output_cb(ppp_pcb *pcb, uint8_t *data, uint32_t len, void *ctx) { + size_t rv; + + xSemaphoreTake(ppp_mutex, portMAX_DELAY); + rv = eos_modem_write(data, len); + xSemaphoreGive(ppp_mutex); + + return rv; +} + +/* PPP status callback */ +static void ppp_status_cb(ppp_pcb *pcb, int err_code, void *ctx) { + // struct netif *pppif = ppp_netif(pcb); + // LWIP_UNUSED_ARG(ctx); + + switch(err_code) { + case PPPERR_NONE: { + ESP_LOGE(TAG, "status_cb: Connect"); + break; + } + case PPPERR_PARAM: { + ESP_LOGE(TAG, "status_cb: Invalid parameter"); + break; + } + case PPPERR_OPEN: { + ESP_LOGE(TAG, "status_cb: Unable to open PPP session"); + break; + } + case PPPERR_DEVICE: { + ESP_LOGE(TAG, "status_cb: Invalid I/O device for PPP"); + break; + } + case PPPERR_ALLOC: { + ESP_LOGE(TAG, "status_cb: Unable to allocate resources"); + break; + } + case PPPERR_USER: { + ESP_LOGE(TAG, "status_cb: User interrupt"); + break; + } + case PPPERR_CONNECT: { + ESP_LOGE(TAG, "status_cb: Connection lost"); + break; + } + case PPPERR_AUTHFAIL: { + ESP_LOGE(TAG, "status_cb: Failed authentication challenge"); + break; + } + case PPPERR_PROTOCOL: { + ESP_LOGE(TAG, "status_cb: Failed to meet protocol"); + break; + } + case PPPERR_PEERDEAD: { + ESP_LOGE(TAG, "status_cb: Connection timeout"); + break; + } + case PPPERR_IDLETIMEOUT: { + ESP_LOGE(TAG, "status_cb: Idle Timeout"); + break; + } + case PPPERR_CONNECTTIME: { + ESP_LOGE(TAG, "status_cb: Max connect time reached"); + break; + } + case PPPERR_LOOPBACK: { + ESP_LOGE(TAG, "status_cb: Loopback detected"); + break; + } + default: { + ESP_LOGE(TAG, "status_cb: Unknown error code %d", err_code); + break; + } + } +} + +static int ppp_pause(uint32_t timeout, uint8_t retries) { + int done = 0; + int len = 0; + int rv = EOS_OK; + char *ok_str = NULL; + uint64_t t_start; + + timeout += 1000; + xSemaphoreTake(ppp_mutex, portMAX_DELAY); + eos_modem_flush(); + vTaskDelay(1000 / portTICK_PERIOD_MS); + modem_set_mode(EOS_CELL_UART_MODE_NONE); + xSemaphoreTake(uart_mutex, portMAX_DELAY); + at_cmd("+++"); + t_start = esp_timer_get_time(); + + do { + len = eos_modem_read(uart_buf + uart_buf_len, sizeof(uart_buf) - uart_buf_len, 10); + if (len > 0) { + if (uart_buf_len > 5) { + ok_str = memstr(uart_buf + uart_buf_len - 5, len + 5, "\r\nOK\r\n"); + } else { + ok_str = memstr(uart_buf, len + uart_buf_len, "\r\nOK\r\n"); + } + uart_buf_len += len; + } + if (ok_str) { + pppos_input_tcpip(ppp_handle, (uint8_t *)uart_buf, ok_str - uart_buf); + ok_str += 6; + uart_buf_len -= ok_str - uart_buf; + if (uart_buf_len) memmove(uart_buf, ok_str, uart_buf_len); + done = 1; + } else if (uart_buf_len == sizeof(uart_buf)) { + pppos_input_tcpip(ppp_handle, (uint8_t *)uart_buf, sizeof(uart_buf) / 2); + memcpy(uart_buf, uart_buf + sizeof(uart_buf) / 2, sizeof(uart_buf) / 2); + uart_buf_len = sizeof(uart_buf) / 2; + } + if (timeout && !done && ((uint32_t)((esp_timer_get_time() - t_start) / 1000) > timeout)) { + if (!retries) { + modem_set_mode(EOS_CELL_UART_MODE_PPP); + xSemaphoreGive(uart_mutex); + xSemaphoreGive(ppp_mutex); + rv = EOS_ERR_TIMEOUT; + done = 1; + } else { + retries--; + at_cmd("+++"); + t_start = esp_timer_get_time(); + } + } + } while (!done); + + return rv; +} + +static int ppp_resume(void) { + int r; + int rv = EOS_OK; + + at_cmd("ATO\r"); + r = at_expect("^CONNECT", "^(ERROR|NO CARRIER)", 1000); + if (r <= 0) rv = EOS_ERR; + + modem_set_mode(EOS_CELL_UART_MODE_PPP); + xSemaphoreGive(uart_mutex); + xSemaphoreGive(ppp_mutex); + + return rv; +} + +static int ppp_setup(void) { + int r; + char cmd[64]; + int cmd_len = snprintf(cmd, sizeof(cmd), "AT+CGDCONT=1,\"IP\",\"%s\"\r", ppp_apn); + + if ((cmd_len < 0) || (cmd_len >= sizeof(cmd))) return EOS_ERR; + + modem_set_mode(EOS_CELL_UART_MODE_NONE); + r = xSemaphoreTake(uart_mutex, 1000 / portTICK_PERIOD_MS); + if (r == pdFALSE) { + modem_set_mode(uart_mode); + return EOS_ERR_TIMEOUT; + } + + at_cmd(cmd); + r = at_expect("^OK", "^ERROR", 1000); + if (r <= 0) { + modem_set_mode(uart_mode); + xSemaphoreGive(uart_mutex); + return EOS_ERR; + } + + at_cmd("AT+CGDATA=\"PPP\",1\r"); + r = at_expect("^CONNECT", "^(ERROR|\\+CME ERROR|NO CARRIER)", 1000); + if (r <= 0) { + modem_set_mode(uart_mode); + xSemaphoreGive(uart_mutex); + return EOS_ERR; + } + + ppp_handle = pppapi_pppos_create(&ppp_netif, ppp_output_cb, ppp_status_cb, NULL); + ppp_set_usepeerdns(ppp_handle, 1); + pppapi_set_default(ppp_handle); + pppapi_set_auth(ppp_handle, PPPAUTHTYPE_PAP, ppp_user, ppp_pass); + pppapi_connect(ppp_handle, 0); + + modem_set_mode(EOS_CELL_UART_MODE_PPP); + xSemaphoreGive(uart_mutex); + + return EOS_OK; +} + +static int ppp_disconnect(void) { + int rv; + + pppapi_close(ppp_handle, 0); + + rv = ppp_pause(1000, 2); + if (rv) return rv; + + at_cmd("ATH\r"); + at_expect("^OK", NULL, 1000); + + xSemaphoreGive(uart_mutex); + xSemaphoreGive(ppp_mutex); + ppp_handle = NULL; + + return EOS_OK; +} + +void eos_modem_init(void) { + /* Configure parameters of an UART driver, + * communication pins and install the driver */ + uart_config_t uart_config = { + .baud_rate = 115200, + .data_bits = UART_DATA_8_BITS, + .parity = UART_PARITY_DISABLE, + .stop_bits = UART_STOP_BITS_1, + .flow_ctrl = UART_HW_FLOWCTRL_DISABLE + }; + uart_param_config(UART_NUM_2, &uart_config); + uart_set_pin(UART_NUM_2, UART_GPIO_TXD, UART_GPIO_RXD, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE); + uart_driver_install(UART_NUM_2, UART_SIZE_IO_BUF, UART_SIZE_IO_BUF, 10, &uart_queue, 0); + + // Configuration for the DTR/RI lines + gpio_config_t io_conf; + + io_conf.intr_type = GPIO_INTR_DISABLE; + io_conf.mode = GPIO_MODE_OUTPUT; + io_conf.pin_bit_mask = ((uint64_t)1 << UART_GPIO_DTR); + io_conf.pull_up_en = 0; + io_conf.pull_down_en = 0; + gpio_config(&io_conf); + gpio_set_level(UART_GPIO_DTR, 0); + + io_conf.intr_type = GPIO_INTR_NEGEDGE; + io_conf.mode = GPIO_MODE_INPUT; + io_conf.pin_bit_mask = ((uint64_t)1 << UART_GPIO_RI); + io_conf.pull_up_en = 0; + io_conf.pull_down_en = 0; + gpio_config(&io_conf); + + mutex = xSemaphoreCreateBinary(); + xSemaphoreGive(mutex); + + uart_mutex = xSemaphoreCreateBinary(); + xSemaphoreGive(uart_mutex); + + ppp_mutex = xSemaphoreCreateBinary(); + xSemaphoreGive(ppp_mutex); + + modem_queue = xQueueCreate(4, sizeof(modem_event_t)); + xTaskCreate(uart_event_task, "uart_event", EOS_TASK_SSIZE_UART, NULL, EOS_TASK_PRIORITY_UART, NULL); + xTaskCreate(modem_event_task, "modem_event", EOS_TASK_SSIZE_MODEM, NULL, EOS_TASK_PRIORITY_MODEM, NULL); + + gpio_isr_handler_add(UART_GPIO_RI, uart_ri_isr_handler, NULL); + + at_init(); + at_urc_insert("^PB DONE", modem_urc_init_handler, REG_EXTENDED); + eos_modem_set_mode(EOS_CELL_UART_MODE_ATCMD); + + ESP_LOGI(TAG, "INIT"); +} + +void eos_modem_flush(void){ + uart_wait_tx_done(UART_NUM_2, portMAX_DELAY); +} + +size_t eos_modem_write(void *data, size_t size) { + return uart_write_bytes(UART_NUM_2, (const char *)data, size); +} + +size_t eos_modem_read(void *data, size_t size, uint32_t timeout) { + return uart_read_bytes(UART_NUM_2, (uint8_t *)data, size, timeout / portTICK_RATE_MS); +} + +int eos_modem_readln(char *buf, size_t buf_size, uint32_t timeout) { + char *ln_end = NULL; + size_t buf_len = 0; + uint64_t t_start = esp_timer_get_time(); + + buf[0] = '\0'; + if (uart_buf_len) { + buf_len = MIN(buf_size -1, uart_buf_len); + memcpy(buf, uart_buf, buf_len); + buf[buf_len] = '\0'; + ln_end = strchr(buf, '\n'); + + uart_buf_len -= buf_len; + if (uart_buf_len) memmove(uart_buf, uart_buf + buf_len, uart_buf_len); + } + + while (ln_end == NULL) { + int len; + + if (buf_len == buf_size - 1) return EOS_ERR_FULL; + if (timeout && ((uint32_t)((esp_timer_get_time() - t_start) / 1000) > timeout)) return EOS_ERR_TIMEOUT; + + len = eos_modem_read(buf + buf_len, MIN(buf_size - buf_len - 1, sizeof(uart_buf) - uart_buf_len), 10); + if (len > 0) { + buf[buf_len + len] = '\0'; + ln_end = strchr(buf + buf_len, '\n'); + buf_len += len; + } + } + buf_len -= ln_end - buf + 1; + if (buf_len) { + if (uart_buf_len) memmove(uart_buf + buf_len, uart_buf, uart_buf_len); + memcpy(uart_buf, ln_end + 1, buf_len); + uart_buf_len += buf_len; + } + + if ((ln_end > buf) && (*(ln_end - 1) == '\r')) ln_end--; + *ln_end = '\0'; + + return EOS_OK; +} + +uint8_t eos_modem_get_mode(void) { + uint8_t ret; + + xSemaphoreTake(mutex, portMAX_DELAY); + ret = uart_mode; + xSemaphoreGive(mutex); + + return ret; +} + +int eos_modem_set_mode(uint8_t mode) { + int rv = EOS_OK; + + xSemaphoreTake(mutex, portMAX_DELAY); + if (mode != uart_mode) { + if (uart_mode == EOS_CELL_UART_MODE_PPP) rv = ppp_disconnect(); + if (!rv) { + if (mode == EOS_CELL_UART_MODE_PPP) { + rv = ppp_setup(); + } else { + modem_set_mode(mode); + } + if (!rv) uart_mode = mode; + } + } + xSemaphoreGive(mutex); + + return rv; +} + +int eos_modem_take(uint32_t timeout) { + int rv = EOS_OK; + + xSemaphoreTake(mutex, portMAX_DELAY); + if (uart_mode == EOS_CELL_UART_MODE_PPP) { + rv = ppp_pause(timeout, 0); + } else { + int r; + + modem_set_mode(EOS_CELL_UART_MODE_NONE); + r = xSemaphoreTake(uart_mutex, timeout ? timeout / portTICK_PERIOD_MS : portMAX_DELAY); + if (r == pdFALSE) { + modem_set_mode(uart_mode); + rv = EOS_ERR_TIMEOUT; + } + } + + if (rv) xSemaphoreGive(mutex); + + return rv; +} + +void eos_modem_give(void) { + if (uart_mode == EOS_CELL_UART_MODE_PPP) { + int rv = ppp_resume(); + if (rv) ESP_LOGW(TAG, "PPP resume failed"); + } else { + modem_set_mode(uart_mode); + xSemaphoreGive(uart_mutex); + } + xSemaphoreGive(mutex); +} + +void eos_modem_sleep(uint8_t mode) { + int r; + + xSemaphoreTake(mutex, portMAX_DELAY); + modem_set_mode(EOS_CELL_UART_MODE_NONE); + r = xSemaphoreTake(uart_mutex, 1000 / portTICK_PERIOD_MS); + if (r == pdFALSE) { + ESP_LOGE(TAG, "Obtaining mutex before sleep failed"); + } + gpio_set_level(UART_GPIO_DTR, 1); + if (mode == EOS_PWR_SMODE_DEEP) { + gpio_hold_en(UART_GPIO_DTR); + } +} + +void eos_modem_wake(uint8_t source, uint8_t mode) { + if (source == EOS_PWR_WAKE_UART) { + modem_event_t evt; + + evt.type = MODEM_ETYPE_RI; + xQueueSend(modem_queue, &evt, portMAX_DELAY); + } + + if (mode != EOS_PWR_SMODE_DEEP) { + gpio_set_intr_type(UART_GPIO_RI, GPIO_INTR_NEGEDGE); + gpio_isr_handler_add(UART_GPIO_RI, uart_ri_isr_handler, NULL); + gpio_set_level(UART_GPIO_DTR, 0); + + modem_set_mode(uart_mode); + xSemaphoreGive(uart_mutex); + xSemaphoreGive(mutex); + } else { + gpio_hold_dis(UART_GPIO_DTR); + } +} + +void eos_ppp_set_apn(char *apn) { + xSemaphoreTake(mutex, portMAX_DELAY); + strncpy(ppp_apn, apn, sizeof(ppp_apn) - 1); + xSemaphoreGive(mutex); +} + +void eos_ppp_set_auth(char *user, char *pass) { + xSemaphoreTake(mutex, portMAX_DELAY); + strncpy(ppp_user, user, sizeof(ppp_user) - 1); + strncpy(ppp_pass, pass, sizeof(ppp_pass) - 1); + xSemaphoreGive(mutex); +} + +int eos_ppp_connect(void) { + return eos_modem_set_mode(EOS_CELL_UART_MODE_PPP); +} + +int eos_ppp_disconnect(void) { + int rv = eos_modem_set_mode(EOS_CELL_UART_MODE_ATCMD); + + xSemaphoreTake(mutex, portMAX_DELAY); + memset(ppp_apn, 0, sizeof(ppp_apn)); + memset(ppp_user, 0, sizeof(ppp_user)); + memset(ppp_pass, 0, sizeof(ppp_pass)); + xSemaphoreGive(mutex); + + return rv; +}
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