171 lines
4.5 KiB
Python
171 lines
4.5 KiB
Python
import serial
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import time
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# === CONFIG ===
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SERIAL_PORT = "/dev/ttyS0"
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BAUDRATE = 9600
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EMQX_HOST = "v92023ed.ala.eu-central-1.emqxsl.com"
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EMQX_PORT = 8883
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CA_FILENAME = "ca.crt"
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CA_LOCAL_PATH = "/home/sigma/emqxsl-ca.crt"
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MQTT_TOPIC = "test/topic"
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MQTT_CLIENT_ID = "rpi_sim7080_test"
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#MQTT_MSG = "Hello over secure MQTT"
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MQTT_QOS = 1
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SSL_CTX_ID = 1
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MQTT_CONN_ID = 0
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NTP_SERVER = "0.cz.pool.ntp.org"
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# additional utilities
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def send_at(cmd, wait_for="OK", timeout=2):
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print(f"> {cmd}")
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ser.write((cmd + "\r\n").encode())
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time.sleep(timeout)
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response = ser.read_all().decode()
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print(response)
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return wait_for in response
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def wait_for_ready():
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while True:
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line = ser.readline().decode()
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print(line.strip())
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break
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# init serial comunication
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ser = serial.Serial(SERIAL_PORT, BAUDRATE, timeout=1)
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time.sleep(2)
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ser.reset_input_buffer()
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wait_for_ready()
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# OLD Chat-GPT + edits code
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# === 1. Basic Setup ===
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#send_at("ATE0")
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#send_at("AT+CPIN?") # Check SIM
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#send_at("AT+CSQ") # Signal strength
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#send_at("AT+CEREG=1")
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#send_at("AT+CGDCONT=1,\"IP\",\"m2m.public.cz\"")
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#send_at("AT+CGACT=1,1")
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#send_at("AT+CGPADDR=1")
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#send_at("AT+CFSINIT")
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#send_at("AT+CNACT=0,1")
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#
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## === 2. Upload CA Certificate ===
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#def upload_cert():
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# with open(CA_LOCAL_PATH, "rb") as f:
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# data = f.read()
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# cert_len = len(data)
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#
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# # Allocate file
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# send_at(f'AT+CFSWFILE=0,"{CA_FILENAME}",0,{cert_len},10000', "DOWNLOAD")
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# ser.write(data)
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# time.sleep(1)
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# print(ser.read_all().decode())
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#
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#upload_cert()
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#
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## === 3. Configure SSL Context ===
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#send_at(f"AT+CSSLCFG=\"sslversion\",1,3") # TLS 1.2
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#send_at(f"AT+CASSLCFG=1,\"cacert\",\"{CA_FILENAME}\"")
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## send_at(f"AT+CSSLCFG=\"\",{SSL_CTX_ID},1") # Server auth only
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#send_at(f"AT+CSSLCFG=\"ignorertctime\",1,1")
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#send_at(f"AT+CSSLCFG=\"sni\",1,1")
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#
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## === 4. Configure MQTT ===
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#send_at(f"AT+SMCONF=\"URL\",\"{EMQX_HOST}\",{EMQX_PORT}")
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#send_at(f"AT+SMCONF=\"KEEPTIME\",60")
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#send_at(f"AT+SMCONF=\"CLIENTID\",\"{MQTT_CLIENT_ID}\"")
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#send_at(f"AT+SMSSL=1,\"{CA_FILENAME}\",\"{CA_FILENAME}\"")
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#send_at("AT+SMCONF=\"CLENASS\",1")
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#
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## === 5. Connect to MQTT Broker ===
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#if not send_at("AT+SMCONN", "OK", timeout=10):
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# print("MQTT connection failed")
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# exit()
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#
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## === 6. Publish Message ===
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#msg_len = len(MQTT_MSG)
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#send_at(f"AT+SMPUB=\"{MQTT_TOPIC}\",{msg_len},{MQTT_QOS}", ">", timeout=1)
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#ser.write(MQTT_MSG.encode() + b"\x1A") # End with Ctrl+Z
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#time.sleep(2)
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#print(ser.read_all().decode())
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# pin init
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send_at("ATE0")
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send_at("AT")
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# reboot and wait
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send_at("AT+CREBOOT")
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print("rebooting... please wait")
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failed = True
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for i in range(1,10):
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if send_at("ATE0", "OK", timeout=3):
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failed = False
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break
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send_at("AT")
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if failed:
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print("failed to reboot")
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exit()
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# set as verbose
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send_at("AT+CMEE=2")
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# sim and rf status check
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send_at("AT+CPIN?")
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send_at("AT+CSQ")
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# manual APN conf
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send_at("AT+CFUN=0")
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send_at("AT+CGDCONT=1,\"IP\",\"m2m.public.cz\"")
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send_at("AT+CFUN=1")
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send_at("AT+CGATT?")
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send_at("AT+CGNAPN")
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send_at("AT+CNCFG=0,1,\"m2m.public.cz\"")
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# APN check
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send_at("AT+CGNAPN")
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# activate apn/pdp
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send_at("AT+CNACT=0,1")
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send_at("AT+CNACT?")
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# synch UTC
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send_at(f'AT+CNTP="{NTP_SERVER}",2,0,2')
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time.sleep(12)
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send_at("AT+CNTP")
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send_at("AT+CCLK?")
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# file system init
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send_at("AT+CFSINIT")
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# upload ca certificate
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with open(CA_LOCAL_PATH, "rb") as f:
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data = f.read()
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cert_len = len(data)
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send_at(f'AT+CFSWFILE=1,"{CA_FILENAME}",0,{cert_len},10000', "DOWNLOAD")
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time.sleep(1)
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print(ser.read_all().decode())
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ser.write(data)
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send_at("AT+CFSTERM")
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# setup mqtt with ssl
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send_at(f'AT+SMCONF="URL","{EMQX_HOST}","{EMQX_PORT}"')
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send_at("AT+SMCONF=\"KEEPTIME\",60")
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send_at("AT+SMCONF=\"CLEANSS\",1")
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send_at(f'AT+SMCONF="CLIENTID","{MQTT_CLIENT_ID}"')
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send_at('AT+SMCONF="QOS",1')
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send_at("AT+SMCONF?")
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# set tls version to 1.2, ignore rtc time and set cipher. then check it
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send_at('AT+CSSLCFG="sslversion",1,3')
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send_at('AT+CSSLCFG="IGNORERTCTIME",1,1')
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send_at('AT+CSSLCFG=“CIPHERSUITE”,1,0,0x0035')
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send_at('AT+CSSLCFG=“CIPHERSUITE”,1,1,0x002F')
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send_at("AT+CSSLCFG?")
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time.sleep(10)
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# convert and use uploaded certificate
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send_at(f'AT+CSSLCFG="CONVERT",2,"{CA_FILENAME}"')
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send_at(f'AT+SMSSL=2,"{CA_FILENAME}",""') # no idea how to CHOOSE the certificte
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send_at("AT+SMSSL?")
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# try to connect
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if not send_at("AT+SMCONN", "OK", timeout=20):
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print(" - FAILED to connect")
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# disconnect/clean-up
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send_at("AT+SMDISC")
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send_at("AT+CNACT=0,0")
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ser.close()
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