Connect SIM7000E to the Internet

General
1

Hi.

I want to connect my SIM7000E to the internet.

When i send the following form a python file i get an "OK" responce from the modem.

send_at('AT+CGDCONT=1,\"IP\",\"'+APN+'\",\"0.0.0.0\",0,0','OK',1)

But when i send the following from a function node in Node-red i get an error from the SIM7000E modem.

var at_cmd = "AT + CGDCONT = ";
msg.payload = at_cmd + "1" + "," + '"IP"' +"," + '"internet"' + "," + '"0.0.0.0"' + "," + "0" + "," + "0" + "\r";
return msg;

When i send the above mention from a function node I get the following reply from the modem: AT + CGDCONT = 1,"IP","internet","0.0.0.0",0,0 followed by an error.

Kindly assist.

2

How have you created your node?
Can you publish it so other people can try it out and see if it works for them?

3

The following is the nodes. Basically a function node with a serial in and a serial out.

[
    {
        "id": "631f73ea1fff92a3",
        "type": "serial out",
        "z": "8f721a97cf856861",
        "name": "Serial-Out",
        "serial": "f4ec6284837b4b4c",
        "x": 1160,
        "y": 120,
        "wires": []
    },
    {
        "id": "36261b28659f2087",
        "type": "serial in",
        "z": "8f721a97cf856861",
        "name": "Serial-In",
        "serial": "f4ec6284837b4b4c",
        "x": 140,
        "y": 420,
        "wires": [
            [
                "7ebbcb39cd8a2533"
            ]
        ]
    },
    {
        "id": "75d63ecf7375cc1b",
        "type": "inject",
        "z": "8f721a97cf856861",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 140,
        "y": 200,
        "wires": [
            [
                "afeb1dae1c42364d"
            ]
        ]
    },
    {
        "id": "7ebbcb39cd8a2533",
        "type": "debug",
        "z": "8f721a97cf856861",
        "name": "debug 10",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 440,
        "y": 440,
        "wires": []
    },
    {
        "id": "afeb1dae1c42364d",
        "type": "function",
        "z": "8f721a97cf856861",
        "name": "AT+CPSI?",
        "func": "var at_cmd = \"AT+CPSI?\";\nmsg.payload = at_cmd + \"\\r\";\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 410,
        "y": 200,
        "wires": [
            [
                "631f73ea1fff92a3",
                "c5b679ad85becc56"
            ]
        ]
    },
    {
        "id": "c5b679ad85becc56",
        "type": "debug",
        "z": "8f721a97cf856861",
        "name": "debug 11",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 600,
        "y": 160,
        "wires": []
    },
    {
        "id": "e894131fc75ea9fc",
        "type": "function",
        "z": "8f721a97cf856861",
        "name": "Define pdp context",
        "func": "var at_cmd = \"AT + CGDCONT = \";\n\nmsg.payload = at_cmd + \"1\" + \",\" + '\"IP\"' +\",\" + '\"internet\"' + \",\" + '\"0.0.0.0\"' + \",\" + \"0\" + \",\"  + \"0\" + \"\\r\";\n// msg.payload = 'AT + CGDCONT = 1, \"IP\", \"internet\", \"0.0.0.0\", 0, 0';\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 430,
        "y": 280,
        "wires": [
            [
                "631f73ea1fff92a3",
                "dcad3515115d6b57"
            ]
        ]
    },
    {
        "id": "7db0b828a23f1ec3",
        "type": "inject",
        "z": "8f721a97cf856861",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 140,
        "y": 280,
        "wires": [
            [
                "e894131fc75ea9fc"
            ]
        ]
    },
    {
        "id": "dcad3515115d6b57",
        "type": "debug",
        "z": "8f721a97cf856861",
        "name": "debug 12",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 700,
        "y": 220,
        "wires": []
    },
    {
        "id": "075412faf0940fc5",
        "type": "inject",
        "z": "8f721a97cf856861",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 140,
        "y": 60,
        "wires": [
            [
                "9f9edb4574b71834"
            ]
        ]
    },
    {
        "id": "9f9edb4574b71834",
        "type": "function",
        "z": "8f721a97cf856861",
        "name": "Get signal strenght",
        "func": "var at_cmd = \"AT+CSQ\";\nmsg.payload = at_cmd + \"\\r\";\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 430,
        "y": 60,
        "wires": [
            [
                "de6e8d0b283786bc",
                "631f73ea1fff92a3"
            ]
        ]
    },
    {
        "id": "de6e8d0b283786bc",
        "type": "debug",
        "z": "8f721a97cf856861",
        "name": "debug 13",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 600,
        "y": 40,
        "wires": []
    },
    {
        "id": "f62215e4e9f3ae6c",
        "type": "inject",
        "z": "8f721a97cf856861",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 140,
        "y": 340,
        "wires": [
            [
                "fedaf03bcd2ab44c"
            ]
        ]
    },
    {
        "id": "fedaf03bcd2ab44c",
        "type": "function",
        "z": "8f721a97cf856861",
        "name": "AT+CSOCKSETPN=1",
        "func": "var at_cmd = \"AT+CSOCKSETPN=1\";\nmsg.payload = at_cmd + \"\\r\";\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 440,
        "y": 340,
        "wires": [
            [
                "bc12585bf1a47de0",
                "631f73ea1fff92a3"
            ]
        ]
    },
    {
        "id": "bc12585bf1a47de0",
        "type": "debug",
        "z": "8f721a97cf856861",
        "name": "debug 15",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 720,
        "y": 340,
        "wires": []
    },
    {
        "id": "00dbc58b6af33db0",
        "type": "inject",
        "z": "8f721a97cf856861",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 140,
        "y": 120,
        "wires": [
            [
                "132579eed25c2ca4"
            ]
        ]
    },
    {
        "id": "132579eed25c2ca4",
        "type": "function",
        "z": "8f721a97cf856861",
        "name": "AT CREG",
        "func": "var at_cmd = \"AT+CREG?\";\nmsg.payload = at_cmd + \"\\r\";\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 400,
        "y": 120,
        "wires": [
            [
                "a79e049054f6af48",
                "631f73ea1fff92a3"
            ]
        ]
    },
    {
        "id": "a79e049054f6af48",
        "type": "debug",
        "z": "8f721a97cf856861",
        "name": "debug 17",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 600,
        "y": 100,
        "wires": []
    },
    {
        "id": "f4ec6284837b4b4c",
        "type": "serial-port",
        "serialport": "/dev/ttyS0",
        "serialbaud": "115200",
        "databits": "8",
        "parity": "none",
        "stopbits": "1",
        "waitfor": "",
        "dtr": "none",
        "rts": "none",
        "cts": "none",
        "dsr": "none",
        "newline": "\\n",
        "bin": "false",
        "out": "char",
        "addchar": "",
        "responsetimeout": "10000"
    }
]

[Edited by Moderator]

5

@SplitSecComp

Any reason you don't code like this?

msg.payload = at_cmd + '1,"IP","internet","0.0.0.0",0,0\r';
6

What does send_at() do?

7

send_at('AT+CGDCONT=1,"IP","'+APN+'","0.0.0.0",0,0','OK',1)

returns an ok if i send it in a python file....it works

8

I have tried this way as well...still get an error. First is what the debug returns from the function node that i send the last two is what the "Serial in" returns
image

9

This is what the python file returns

image
image723×170 3.77 KB

10

I am baffled :grinning:

11

There is the obvious difference that you have several spaces in the string shown in the debug. Try taking those out.

12

Many thanks i have removed the spaces. Its now working :+1:

14

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