Send data with At-Command in OpenCPU

Technical Subjects
1

Hi
How can i send input the data After the response > in OpenCPU with Ql_RIL_SendATCmd() ?
for example i need to use (AT+QMTPUB) with Ql_RIL_SendATCmd() and send a data(e.g. time or temp) after response > sign with Ctrl+Z.
Thank you

Ql_sprintf(atComm, “AT+QMTPUB=0,0,0,0,”%s"", MQTT_TOPIC);
ret = Ql_RIL_SendATCmd(atComm, Ql_strlen(atComm), NULL, NULL, 0);

2

Dear bsalmani69

Do you need to use ‘Ql_RIL_SendATCmd’ to use AT command in OPEN mode or send and receive data through serial port?

Please give detailed feedback on the module model and SDK version you use.

3

Dear Grey Thanks your response

I’m using MC60 module and programming in SDK version 1.7
I need use AT-Command in Open-mode to use MQTT protocol for send data to MQTT-server. After Config/Open GPRS and PDP context, I can Connect to Broker with Ql_RIL_SendATCmd(AT+QMTCONN) but when i use AT+QMTPUB with Ql_RIL_SendATCmd, i can’t send data to server after response > and return (-1).

How can i detect (response >) and send data with Ctrl+Z (0x1A) in this Ql-Command?
How can i send data to MQTT-Server with Ql_RIL_SendATCmd(AT+QMTPUB)?
Please help me to solve this problem.

4

static void MQTT_Program()
{
s32 ret;
ret = RIL_NW_SetGPRSContext(Ql_GPRS_GetPDPContextId());
APP_DEBUG(“START SEND TO SERVER\r\n”);
ret = RIL_NW_SetAPN(1, APN_NAME, APN_USERID, APN_PASSWD);
APP_DEBUG("<-- Set GPRS APN, ret=%d -->\r\n", ret);
ret = RIL_NW_OpenPDPContext();
APP_DEBUG("<-- Open PDP context, ret=%d -->\r\n", ret);

// Packaging At-Command for Open a network for MQTT client
Ql_sprintf(atComm, “AT+QMTOPEN=0,”%s","%s"", MQTT_SRV_ADD, MQTT_SRV_PORT);
ret = Ql_RIL_SendATCmd(atComm, Ql_strlen(atComm), NULL, NULL, 0);
if(ret == 0)
{
APP_DEBUG("<-- Opened a Network for MQTT Client, ret=%d -->\r\n", ret);
}
else
{
APP_DEBUG("<-- Opennig a Network for MQTT Client Failed, ret=%d -->\r\n", ret);
}

// Packaging At-Command for Connect a client to MQTT server
Ql_sprintf(atComm, “AT+QMTCONN=0,”%s","%s","%s"", MQTT_CLIENT_ID, MQTT_CLIENT_USER, MQTT_CLIENT_PASS);
ret = Ql_RIL_SendATCmd(atComm, Ql_strlen(atComm), NULL, NULL, 0);
if(ret == 0)
{
APP_DEBUG("<-- Connected Client to MQTT Server, ret=%d -->\r\n", ret);
}
else
{
APP_DEBUG("<-- Connecting Client to MQTT Server Failed, ret=%d -->\r\n", ret);
}

// Packaging At-Command for Publish messages in MQTT
Ql_memset(atComm, 0, sizeof(atComm));
Ql_sprintf(atComm, "AT+QMTPUB=0,0,0,0,\"%s\"", MQTT_TOPIC);
ret = Ql_RIL_SendATCmd(atComm, Ql_strlen(atComm), NULL, NULL, 0);
if(ret == 0)
{
APP_DEBUG("<-- Publishing a Message in MQTT..., ret=%d -->\r\n", ret);
 }
else
{
APP_DEBUG("<-- Publishing a Message in MQTT Failed, ret=%d -->\r\n", ret);
}

// Packaging At-Command for Disconnect a client from MQTT server
Ql_memset(atComm, 0, sizeof(atComm));
Ql_sprintf(atComm, "AT+QMTDISC=0");
ret = Ql_RIL_SendATCmd(atComm, Ql_strlen(atComm), NULL, NULL, 0);
if(ret == 0)
{
APP_DEBUG("<-- Disconnect Client from MQTT Server, ret=%d -->\r\n", ret);
 }

else
{
APP_DEBUG("<-- Disconnecting Client from MQTT Server Failed, ret=%d -->\r\n", ret);
}

ret = RIL_NW_ClosePDPContext();
APP_DEBUG("<-- Close PDP context, ret=%d -->\r\n", ret);
6

Dear Grey Thanks your response

I’m using MC60 module and programming in SDK version 1.7
I need use AT-Command in Open-mode to use MQTT protocol for send data to MQTT-server. After Config/Open GPRS and PDP context, I can Connect to Broker with Ql_RIL_SendATCmd(AT+QMTCONN) but when i use AT+QMTPUB with Ql_RIL_SendATCmd, i can’t send data to server after response > and return (-1).

How can i detect (response >) and send data with Ctrl+Z (0x1A) in this Ql-Command?
How can i send data to MQTT-Server with Ql_RIL_SendATCmd(AT+QMTPUB)?
Please help me to solve this problem.

7

Hi Babak
You can use Ql_RIL_WriteDataToCore function in AT commands callback

Why reinvent the wheel? There is MQTT RIL library written by Quectel guys.
Here you are my compatriot

ril_mqtt.zip (4.2 KB)

8

Dear bsalmani69

Not all AT instructions are supported in OPEN mode. For details about how to use MQTT, see example_MQtt in the SDK.Thank you.

9

Thank you Dear Ahmadreza

It was great and my problem with this library solved.