DA16200MOD MQTT JSON Formate AT Command communication.

Question

Hello Team, 
 
 I am going to use the MQTT Protocol, and i want to send data on JSON format is this possible. Because this i read your documents in that JSON formate AT command is only for HTTP and HTTPS protocol. if i want to use MQTT protocol then which language should we use to design the IOT page. 
 and another information required i am not using RTC then RTC sensor should give ground or VDD. 
 because my SDK is not load in module they stuck in middle i think this is because of RTC is goes in SLEEP mode so what should we do to WAKE UP this RTC. 
 Best Regard's 
 AK.

ak · Accepted Answer

Hello, 
 I successfully load the SDK and i get AT command OK.the problem which i face is in PDF of DA16200MOD has no mention RTC Sensor Pin function so i keep this pin open so that why the SDK is not loading at that time.so i read in one pdf and as you suggest that this PIN should be GND or VDD according sensor design. i make this PIN GND and SDK load.

OV_Renesas · Answer

Hi Ak, Thank you for the reply. 
 ak said: i want make connection of two LED to this DA16200MOD for when transmission will happen that red will glow and receive time blue will glow so tell what to do in SDK file to this operation. 
 Are you talking about Wi-Fi transmission or AT cmd transmissions? Generally for controlling LED, please refer on UM-WI-046 DA16200 DA16600 FreeRTOS SDK Programmer Guide (renesas.com) , on section 17.2 GPIO page:263 Best Regards, OV_Renesas

OV_Renesas · Answer

Hi AK,

Thank you for the reply.
IF you are trying to connect to AWS Server via MQTT, please refer here: DA16200 DA16600 Getting Started with AWS IoT Core (renesas.com)
You will need the AWS IoT Reference for FreeRTOS SDK or the AWS IoT ATCMD Image for FreeRTOS SDK which can be found on the DA16200/DA16200MOD/DA16600MOD product pages under Software Downloads;

Please follow the ReadMe files on how to integrate the AWS features into the FreeRTOS SDK.

If you are still facing issues, please attach a logic analyzer on the UART/SPI lines being used for AT command transport and share the capture with us.
We would also like the full UART0 log files.

Best Regards,
OV_Renesas

OV_Renesas · Answer

Hi AK,

Thank you for the replies.
It is not exactly clear what you are trying to achieve.
However, for MQTT AT Commands you should use the following:

When you send this AT command the following part will be executed in the atcmd.c file:

   // AT+NWMQMSG
    else if (strcasecmp(argv[0] + 5, "MQMSG") == 0) {
        char *top;

        if (argc == 2 || argc == 3) {
            int rsp_val;

            /* AT+NWMQMSG=<msg>(,<topic>) (set only) */
            if (strlen(argv[1]) > MQTT_MSG_MAX_LEN) {
                err_code = AT_CMD_ERR_NW_MQTT_PUB_MESSAGE_LEN;
                goto atcmd_network_end;
            }

            if (argc == 2) {
                top = NULL;
            } else if (argc == 3) {
                if (strlen(argv[2]) > MQTT_TOPIC_MAX_LEN) {
                    err_code = AT_CMD_ERR_NW_MQTT_PUB_TOPIC_LEN;
                    goto atcmd_network_end;
                } else {
                    top = argv[2];
                }
            }

            rsp_val = mqtt_client_send_message(top, argv[1]);

            if (rsp_val == -1) {
                err_code = AT_CMD_ERR_NW_MQTT_NOT_CONNECTED;
            } else if (rsp_val == -2) {
                // in-flight message is in progress
                err_code = AT_CMD_ERR_NW_MQTT_PUB_TX_IN_PROGRESS;
            } else if (rsp_val == -3) {
                // no topic in mqtt configuration
                err_code = AT_CMD_ERR_NW_MQTT_PUB_TOPIC_NOT_EXIST;
            } else if (rsp_val == 9 /* MOSQ_ERR_PAYLOAD_SIZE */) {
                // paylod too long
                err_code = AT_CMD_ERR_NW_MQTT_PUB_MESSAGE_LEN;
            } else {
                // pre-check passed ...
                if (dpm_mode_is_enabled() == pdTRUE) {
                    if (mqtt_client_get_qos() > 0) { // qos 1 or 2
                        if (rsp_val != 0) {
                            mqtt_client_convert_to_atcmd_err_code(&rsp_val, &err_code);
                        }
                    } else {                          // qos 0
                        if (rsp_val != 0) {
                            mqtt_client_convert_to_atcmd_err_code(&rsp_val, &err_code);
                        } else {
                            // make async +NWMQMSGSND:1 to sync print
                            atcmd_mqtt_qos0_msg_send_done_in_dpm = TRUE;
                            atcmd_mqtt_qos0_msg_send_rc = 0;
                        }
                    }
                }
            }
        } else {
            err_code = AT_CMD_ERR_INSUFFICENT_ARGS;
        }
    }

You can either turn ON the LED when it enters in that if statement, or directly inside the mqtt_client_send_message API.
Then after the if statement controlling the rsp_val is being handled you can turn the LED off. Or you can do this on the same file on the following APIs:

void mqtt_client_convert_to_atcmd_err_code(int* err_code, int* atcmd_err_code)
{
    int mosq_err_code = *err_code;

    if (mosq_err_code == MOSQ_ERR_INVAL || mosq_err_code == MOSQ_ERR_PAYLOAD_SIZE) {
        *atcmd_err_code = AT_CMD_ERR_WRONG_ARGUMENTS;
    } else if (mosq_err_code == MOSQ_ERR_NO_CONN || mosq_err_code == MOSQ_ERR_CONN_LOST) {
        *atcmd_err_code = AT_CMD_ERR_NOT_CONNECTED;
    } else {
        *atcmd_err_code = AT_CMD_ERR_UNKNOWN;
    }
}

void atcmd_asynchony_event_for_mqttmsgpub(int result, int err_code)
{
    int atcmd_err;

    if (result == 1) {
        PRINTF_ATCMD("\r\n+NWMQMSGSND:1\r\n");
    } else if (result == 0) {
        mqtt_client_convert_to_atcmd_err_code(&err_code, &atcmd_err);
        PRINTF_ATCMD("\r\n+NWMQMSGSND:0,%d\r\n", atcmd_err);
    }
}

This way, when you try to publish a MQTT message you will turn on the LED while the MQTT transmission is in progress, and when you receive the MQTT result (so no Wi-Fi transmission is on going) you will turn the LED OFF.

If you want to implement this behavior for every AT command:
On the atcmd.c file you can see that we have multiple functions to control the AT commands based on their features.
Those are:
1. help_command
2. atcmd_standard
3. atcmd_uartconf
4. atcmd_basic
5. atcmd_dpm
6. atcmd_wifi
7. atcmd_network
8. atcmd_transport
9. atcmd_transport_ssl
10. atcmd_testmode
11. atcmd_rftest
12. atcmd_rftx
13. atcmd_tfcwttest
14. atcmd_rf_per
15. atcmd_rf_cont
16. atcmd_chan
etc.

At the start of these functions you can turn on the LED and when these functions return the status (Error Code or OK) you can turn the LED off.
If you do not want to edit all those functions, you can just directly edit the command_parser API (on the atcmd.c file) and open the LED on there and turn it OFF when you have received the response message.

Best Regards,
OV_Renesas

OV_Renesas · Answer

Hi AK, Thank you for posting your questions online. 
 ak said: I am going to use the MQTT Protocol, and i want to send data on JSON format is this possible. Because this i read your documents in that JSON formate AT command is only for HTTP and HTTPS protocol. if i want to use MQTT protocol then which language should we use to design the IOT page. 
 You can use the JSON format with MQTT protocol. The DA16200 SDK supports JSON and we provide a sample code. The JSON sample code is located in the below SDK directory: [SDK root] /0.DOC/Doxygen/html/json.html 
 ak said: and another information required i am not using RTC then RTC sensor should give ground or VDD. 
 because my SDK is not load in module they stuck in middle i think this is because of RTC is goes in SLEEP mode so what should we do to WAKE UP this RTC. 
 Please refer on DA16200 Datasheet (renesas.com) , on section 7.4 RTC, page:41 The RTC GPIOs should be used to control the sleep modes. The API names to control the RTC_GPO are the following: /**
 ****************************************************************************************
 * @brief This function initializes the RTC_GPO pin.
 * @param[in] mode 0: Auto mode (output high in power on state and output low in sleep state)
 * mode 1: Manual mode
 *
 ****************************************************************************************
 */
void RTC_GPO_OUT_INIT(UINT8 mode);

/**
 ****************************************************************************************
 * @brief Set RTC_GPO output level.
 * @param[in] value of GPO 0: low, 1: high
 *
 ****************************************************************************************
 */
void RTC_GPO_OUT_CONTROL(UINT8 value); Best Regards, OV_Renesas

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