AM7020 Raspberry Pi 範例程式碼

AM7020 (SIMCOM SIM7020E) 窄頻物聯網(NBIoT)模組 Raspberry Pi 範例程式碼

Installation

To install am7020:

$ sudo pip3 install -i https://test.pypi.org/simple/ am7020

啟用Raspberry Pi UART

• Step1: Terminal input sudo raspi-config.
• Step2: Select Interfacing Options.
• Step3: Select Serial.
• Step4: Select "NO".
• Step5: Select "YES".
• Step6: Reboot Pi.

MQTT 教學說明

Declare nb and mqtt client instance using:

nb = SIM7020NB(port="/dev/ttyS0", baudrate=115200, reset_pin=18)
mqtt = SIM7020MQTT(nb)

Initialize nb and connect to NBIOT base station:

while((not nb.init() or (not nb.nbiotConnect(apn, band)))):
    print(".")

while(not nb.waitForNetwork()):
    print(".")
    sleep(5)

Check MQTT connection status and connect to Broker:

if(not mqtt.chkConnBroker()):
    mqtt.connBroker(MQTT_BROKER, 1883, mqtt_id="MY_AM7020_TEST_MQTTID")

Publish and subscribe:

mqtt.publish(TEST_TOPIC, "Hello MQTT")

def callback1(msg):
    print(TEST_TOPIC, ":", msg)
mqtt.subscribe(TEST_TOPIC, callback1)

Listen for messages from the broker:

mqtt.procSubs()

HTTP 教學說明

Declare nb and http client instance using:

nb = SIM7020NB(port="/dev/ttyS0", baudrate=115200, reset_pin=18)
http = SIM7020HTTP(nb, HTTP_SERVER)

Initialize nb and connect to NBIOT base station:

while((not nb.init() or (not nb.nbiotConnect(apn, band)))):
    print(".")

while(not nb.waitForNetwork()):
    print(".")
    sleep(5)

HTTP GET and POST:

http.get(HTTP_GET_API)
state_code = http.responseStatusCode()
body = http.responseBody()

http.post(HTTP_POST_API, content_type="application/json", body="{\"value\": \"POST\"}")
state_code = http.responseStatusCode()
body = http.responseBody()