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PPP: Add send_text_message for #14.

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Also a quick cleanup of the lte module code.
This commit is contained in:
Phil Howard 2024-10-04 15:41:00 +01:00
parent 6c6a839903
commit bfcb181cdf
1 changed files with 33 additions and 28 deletions
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61
micropython/modules_py/lte.py
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@ -18,8 +18,8 @@ DEFAULT_UART_BAUD = const(460800)
class CellularError(Exception): class CellularError(Exception):
def __init__(self, message=None): def __init__(self, message=None):
self.message = "CellularError: " + message self.message = f"CellularError: {message}"
class LTE(): class LTE():
@ -30,13 +30,13 @@ class LTE():
DEFAULT_UART_ID, DEFAULT_UART_ID,
tx=Pin(DEFAULT_PIN_TX, Pin.OUT), tx=Pin(DEFAULT_PIN_TX, Pin.OUT),
rx=Pin(DEFAULT_PIN_RX, Pin.OUT)) rx=Pin(DEFAULT_PIN_RX, Pin.OUT))
# Set PPP timeouts and rxbuf # Set PPP timeouts and rxbuf
self._uart.init( self._uart.init(
timeout=DEFAULT_UART_TIMEOUT, timeout=DEFAULT_UART_TIMEOUT,
timeout_char=DEFAULT_UART_TIMEOUT_CHAR, timeout_char=DEFAULT_UART_TIMEOUT_CHAR,
rxbuf=DEFAULT_UART_RXBUF) rxbuf=DEFAULT_UART_RXBUF)
if not skip_reset: if not skip_reset:
self._reset.value(0) self._reset.value(0)
time.sleep(1.0) time.sleep(1.0)
@ -46,7 +46,7 @@ class LTE():
self._led = netlight_led self._led = netlight_led
self._netlight = netlight_pin or Pin(DEFAULT_PIN_NETLIGHT, Pin.IN) self._netlight = netlight_pin or Pin(DEFAULT_PIN_NETLIGHT, Pin.IN)
self._netlight.irq(self._netlight_irq) self._netlight.irq(self._netlight_irq)
def _netlight_irq(self, pin): def _netlight_irq(self, pin):
self._led.value(pin.value()) self._led.value(pin.value())
@ -60,23 +60,23 @@ class LTE():
try: try:
return self._send_at_command("AT+CICCID", 1) return self._send_at_command("AT+CICCID", 1)
except CellularError: except CellularError:
return None return None
def status(self): def status(self):
lte_status = self._send_at_command("AT+CEREG?", 1) lte_status = self._send_at_command("AT+CEREG?", 1)
gsm_status = self._send_at_command("AT+CGREG?", 1) gsm_status = self._send_at_command("AT+CGREG?", 1)
return lte_status, gsm_status return lte_status, gsm_status
def signal_quality(self): def signal_quality(self):
try: try:
response = self._send_at_command("AT+CSQ", 1) response = self._send_at_command("AT+CSQ", 1)
quality = int(response.split(":")[1].split(",")[0]) quality = int(response.split(":")[1].split(",")[0])
db = -113 + (2 * quality) # conversion as per AT command set datasheet db = -113 + (2 * quality) # conversion as per AT command set datasheet
return db return db
except CellularError: except CellularError:
pass pass
return None return None
def stop_ppp(self): def stop_ppp(self):
self._ppp.disconnect() self._ppp.disconnect()
self._send_at_command(f"AT+IPR={DEFAULT_UART_STARTUP_BAUD}") self._send_at_command(f"AT+IPR={DEFAULT_UART_STARTUP_BAUD}")
@ -106,11 +106,9 @@ class LTE():
# print(e) # print(e)
# Force PPP to use modem's default settings... # Force PPP to use modem's default settings...
#time.sleep(2.0)
self._flush_uart() self._flush_uart()
self._uart.write("ATD*99#\r") self._uart.write("ATD*99#\r")
self._uart.flush() self._uart.flush()
#time.sleep(2.0)
self._ppp = PPP(self._uart) self._ppp = PPP(self._uart)
self._ppp.connect() self._ppp.connect()
@ -122,16 +120,16 @@ class LTE():
def connect(self, timeout=60): def connect(self, timeout=60):
print(" - setting up cellular uart") print(" - setting up cellular uart")
# connect to and flush the uart # connect to and flush the uart
# consume any unsolicited messages first, we don't need those # consume any unsolicited messages first, we don't need those
self._flush_uart() self._flush_uart()
print(" - waiting for cellular module to be ready") print(" - waiting for cellular module to be ready")
# wait for the cellular module to respond to AT commands # wait for the cellular module to respond to AT commands
self._wait_ready() self._wait_ready()
self._send_at_command("ATE0") # disable local echo self._send_at_command("ATE0") # disable local echo
self._send_at_command(f"AT+CGDCONT=1,\"IP\",\"{self._apn}\"") # set apn and activate pdp context self._send_at_command(f"AT+CGDCONT=1,\"IP\",\"{self._apn}\"") # set apn and activate pdp context
# wait for roaming lte connection to be established # wait for roaming lte connection to be established
giveup = time.time() + timeout giveup = time.time() + timeout
@ -140,10 +138,10 @@ class LTE():
status = self._send_at_command("AT+CEREG?", 1) status = self._send_at_command("AT+CEREG?", 1)
time.sleep(0.25) time.sleep(0.25)
if time.time() > giveup: if time.time() > giveup:
raise CellularError("timed out getting network registration") raise CellularError("timed out getting network registration")
# disable server and client certification validation # disable server and client certification validation
self._send_at_command("AT+CSSLCFG=\"authmode\",0,0") self._send_at_command("AT+CSSLCFG=\"authmode\",0,0")
self._send_at_command("AT+CSSLCFG=\"enableSNI\",0,1") self._send_at_command("AT+CSSLCFG=\"enableSNI\",0,1")
print(f" - SIM ICCID is {self.iccid()}") print(f" - SIM ICCID is {self.iccid()}")
@ -152,13 +150,14 @@ class LTE():
giveup = time.time() + timeout giveup = time.time() + timeout
while time.time() <= giveup: while time.time() <= giveup:
try: try:
# if __send_at_command doesn't throw an exception then we're good!
self._send_at_command("AT") self._send_at_command("AT")
return # if __send_at_command doesn't throw an exception then we're good! return
except CellularError as e: except CellularError as e:
print(e) print(e)
time.sleep(poll_time) time.sleep(poll_time)
raise CellularError("timed out waiting for AT response") raise CellularError("timed out waiting for AT response")
def _flush_uart(self): def _flush_uart(self):
self._uart.flush() self._uart.flush()
@ -168,28 +167,22 @@ class LTE():
time.sleep(0.25) time.sleep(0.25)
def _send_at_command(self, command, result_lines=0, timeout=5.0): def _send_at_command(self, command, result_lines=0, timeout=5.0):
# consume any unsolicited messages first, we don't need those # consume any unsolicited messages first, we don't need those
self._flush_uart() self._flush_uart()
self._uart.write(command + "\r") self._uart.write(command + "\r")
#print(f" - tx: {command}")
self._uart.flush() self._uart.flush()
status, data = self._read_result(result_lines, timeout=timeout) status, data = self._read_result(result_lines, timeout=timeout)
print(" -", command, status, data) print(" -", command, status, data)
if status == "TIMEOUT":
#print.error(" !", command, status, data)
raise CellularError(f"cellular module timed out for command {command}")
if status not in ["OK", "DOWNLOAD"]: if status not in ["OK", "DOWNLOAD"]:
#print(" !", command, status, data)
raise CellularError(f"non 'OK' or 'DOWNLOAD' result for command {command}") raise CellularError(f"non 'OK' or 'DOWNLOAD' result for command {command}")
if result_lines == 1: if result_lines == 1:
return data[0] return data[0]
if result_lines > 1: if result_lines > 1:
return data return data
return None return None
def _read_result(self, result_lines, timeout=1.0): def _read_result(self, result_lines, timeout=1.0):
@ -199,7 +192,7 @@ class LTE():
timeout *= 1000 timeout *= 1000
while len(result) < result_lines or status is None: while len(result) < result_lines or status is None:
if (time.ticks_ms() - start) > timeout: if (time.ticks_ms() - start) > timeout:
return "TIMEOUT", [] raise CellularError("cellular module timed out")
line = self._uart.readline() line = self._uart.readline()
@ -213,3 +206,15 @@ class LTE():
return status, result return status, result
def send_text_message(self, recipient, body, timeout=5.0):
self._uart.write("AT+CMGS=\"")
self._uart.write(recipient.encode("ascii"))
self._uart.write(b"\"\r")
time.sleep(0.5)
self._uart.write(body.encode("ascii"))
self._uart.write(b"\x1a\r")
self._uart.flush()
status, _ = self._read_result(1, timeout=timeout)
return status == "OK"