Libuarte + GSM Communication

[Muqarrab]

Hi,

I am communicating SIM808 with nRF52840. I have made changes in libuarte example and send AT commands to send SMS. I have the following question.

1. How can I know that I have received complete data?
2. How can I send (char) 26 (termination character) at the end of SMS?
3. Is there any library available for sending sms and MQTT communication?

Thanks!

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/** @file
 * @defgroup libuarte_example_main main.c
 * @{
 * @ingroup libuarte_example
 * @brief Libuarte Example Application main file.
 *
 * This file contains the source code for a sample application using libuarte.
 *
 */

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

#include "nrf_libuarte_async.h"
#include "nrf_drv_clock.h"
#include <bsp.h>
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#include "nrf_queue.h"
#include "nrf_delay.h"




NRF_LIBUARTE_ASYNC_DEFINE(libuarte, 0, 0, 0, NRF_LIBUARTE_PERIPHERAL_NOT_USED, 255, 3);

static uint8_t text[] = "UART example started5.\r\nLoopback:\r\n";
static uint8_t text_size = sizeof(text);
static volatile bool m_loopback_phase;

static uint8_t command[]="123456789012345123456534623465351235412344123412341234";

unsigned char received_data[50];
int count_data=0;

bool data_completed=false;


typedef struct {
    uint8_t * p_data;
    uint32_t length;
} buffer_t;

NRF_QUEUE_DEF(buffer_t, m_buf_queue, 10, NRF_QUEUE_MODE_NO_OVERFLOW);

void uart_event_handler(void * context, nrf_libuarte_async_evt_t * p_evt)
{
    nrf_libuarte_async_t * p_libuarte = (nrf_libuarte_async_t *)context;
    ret_code_t ret;

    switch (p_evt->type)
    {
        case NRF_LIBUARTE_ASYNC_EVT_ERROR:
            bsp_board_led_invert(0);
            break;
        case NRF_LIBUARTE_ASYNC_EVT_RX_DATA:


            //if(((unsigned char)*(p_evt->data.rxtx.p_data)>=0x20&(unsigned char)*(p_evt->data.rxtx.p_data)<=0xFE))
            if((unsigned char)*(p_evt->data.rxtx.p_data)!=0)
            {
                  received_data[count_data]=(unsigned char)*(p_evt->data.rxtx.p_data);
                  count_data=count_data+1;
            }
            //else
            //{

            //              printf("%d\n",(unsigned char)*(p_evt->data.rxtx.p_data));
            //}

            //if(received_data[count_data-2]==13 &received_data[count_data-1]==10)
            //    printf("Carriage\n");
            //  //data_completed=true;

            m_loopback_phase = true;
//            printf("Rx Called\n");
            break;
        case NRF_LIBUARTE_ASYNC_EVT_TX_DONE:
            if (m_loopback_phase)
            {
                nrf_libuarte_async_rx_free(p_libuarte, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
                if (!nrf_queue_is_empty(&m_buf_queue))
                {
                    buffer_t buf;
                    ret = nrf_queue_pop(&m_buf_queue, &buf);
                    APP_ERROR_CHECK(ret);
                    UNUSED_RETURN_VALUE(nrf_libuarte_async_tx(p_libuarte, buf.p_data, buf.length));
                }
            }
            bsp_board_led_invert(2);
           // printf("Tx Called\n");
            break;
        default:
            break;
    }
}

/**
 * @brief Function for main application entry.
 */

bool send_command(char cmd[],int size_cmd)
{
    ret_code_t err_code;
    count_data=0;
     
    for (int i=0;i<25;i++)
    {
      received_data[i]=0;
    }

    printf("Sending  : ");
    printf(cmd);

    memset(command, 0, sizeof(command));
    
    for (int i=0;i<size_cmd;i++)
    {
      command[i]=cmd[i];   
    }
    do {
        err_code = nrf_libuarte_async_tx(&libuarte, command,sizeof(command));
        }
    while (err_code == NRF_ERROR_BUSY);

    APP_ERROR_CHECK(err_code);

    nrf_delay_ms(1000);
    printf("Received : %s\n",received_data);

    //char *ret;
    //ret = strstr(received_data, "OK");
    //printf("Response is: %s\n", ret);
    printf("-----------------------------------------------------\n");
}
int main(void)
{
    bsp_board_init(BSP_INIT_LEDS);
    
    ret_code_t ret = nrf_drv_clock_init();
    APP_ERROR_CHECK(ret);
  
    nrf_drv_clock_lfclk_request(NULL);

    ret_code_t err_code = NRF_LOG_INIT(app_timer_cnt_get);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();

    nrf_libuarte_async_config_t nrf_libuarte_async_config = {
            .tx_pin     = TX_PIN_NUMBER,
            .rx_pin     = RX_PIN_NUMBER,
            .baudrate   = NRF_UARTE_BAUDRATE_9600,
            .parity     = NRF_UARTE_PARITY_EXCLUDED,
            .hwfc       = NRF_UARTE_HWFC_DISABLED,
            .timeout_us = 100,
            .int_prio   = APP_IRQ_PRIORITY_LOW
    };

    err_code = nrf_libuarte_async_init(&libuarte, &nrf_libuarte_async_config, uart_event_handler, (void *)&libuarte);

    APP_ERROR_CHECK(err_code);

    nrf_libuarte_async_enable(&libuarte);
    
    //send_command("AT\n",sizeof("AT\n"));
    //send_command("AT+GSN\n",sizeof("AT+GSN\n"));
    //send_command("AT+CSQ\n",sizeof("AT+CSQ\n"));
    //send_command("AT+CCID\n",sizeof("AT+CCID\n"));
    //send_command("AT+CREG?\n",sizeof("AT+CREG?\n"));
    //send_command("AT+CMGF=1\n",sizeof("AT+CMGF=1\n"));
    //send_command("AT+CMGR=1\n",sizeof("AT+CMGR=1\n"));

    //sim.println("AT+CMGS=\"" + Auth_Number + "\"\r"); //Mobile phone number to send message
    //delay(1000);
    //sim.print(BLE_Feedback);
    //delay(100);
    //sim.println((char)26);// ASCII code of CTRL+Z


    send_command("AT\n",sizeof("AT\n"));
    send_command("AT+GSN\n",sizeof("AT+GSN\n"));
    send_command("AT+CSQ\n",sizeof("AT+CSQ\n"));
    //send_command("AT+CCID\n",sizeof("AT+CCID\n"));
    //send_command("AT+CREG?\n",sizeof("AT+CREG?\n"));
    send_command("AT+CMGF=1\n",sizeof("AT+CMGF=1\n"));
    //send_command("AT+CSCS=\"GSM\"\r\n",sizeof("AT+CSCS=\"GSM\"\r\n"));
    send_command("AT+CMGS=\"[phone]\"\r\n",sizeof("AT+CMGS=\"[phone]\"\r\n"));
    send_command("Hello World\n",sizeof("Hello World\n")); 
    //send_command("\x1a",sizeof("\x1a"));

nrf_serial_write()

    while (true)
    {
        NRF_LOG_FLUSH();
    }
}


/** @} */

[Øyvind]

Hello, I assume you are using the nRF5 SDK v17.0.2

How can I know that I have received complete data?

 Looking through the libuarte library documentation, there is a TX done event which should give an indication.

 

How can I send (char) 26 (termination character) at the end of SMS?

 I'm afraid I do not have that information. This sounds like information that should be stated in the modem, SIM808.

 

Is there any library available for sending sms and MQTT communication?

 Have you tried looking at our nRF Connect SDK? In the Zephyr repository there is a Generic GSM modem sample, tested with SIM808. This should also easily be combined with one of the MQTT samples available in the samples.

Kind regards,
Øyvind

[Muqarrab]

Thanks, @Øyvind for your reply.

Øyvind said:

I assume you are using the nRF5 SDK v17.0.2

Yes, I am using this.

Øyvind said:

Have you tried looking at our nRF Connect SDK? In the Zephyr repository there is a Generic GSM modem sample, tested with SIM808. This should also easily be combined with one of the MQTT samples available in the samples.

I have already developed an application as a peripheral.  I have to add this communication part in that application later. Can I use that example to add to my application?

Thanks

[Øyvind]

Hi Muqarrab, 

Muqarrab said:

I have already developed an application as a peripheral.  I have to add this communication part in that application later. Can I use that example to add to my application?

You will need to port you application from nRF5 SDK to nRF Connect SDK to use the example I linked, there is a big difference between the two SDK. The nRF Connect SDK is constantly evolving, and is more open source which allows users to easily contribute via Github. E.g. to implement newer Bluetooth 5 features, one must to nRF Connect SDK in order to develop using Bluetooth 5. NCS will be the future SDK for our products, but the nRF5 SDK will still be supported. 

[Muqarrab]

Is there any GSM example in nRF5 SDK?

[Øyvind]

Muqarrab said:

Is there any GSM example in nRF5 SDK?

No, not that I'm aware of. There might be something in the forum from other customers.

[Muqarrab]

Hi,

I have installed nRF Connect SDK and open MQTT_simple and run code and getting the following error.

Does any Solution please?

[Øyvind]

What version of NCS are you running? Have tried to customize the code in any way? Building the mqtt_simple from NCS v1.6.1 does not provide any errors on my side using Segger Embedded Studio Nordic Edition 5.50c. 

Please make sure to use an official tag of NCS, with NCS 1.6.1 being latest, but the release candidate for 1.7.0 is also available. The latest/master branch tends to be more unstable as this may have new features under testing. 

How did you install NCS? Please try with the Toolchain Manager found in the nRF Connect for Desktop software.

Kind regards,
Øyvind

[Muqarrab]

Øyvind said:

What version of NCS are you running?

I am running 1.6.1. I have not changed anything.