peripheral.py returns errors when commanding #2
Description
Dear James
using esp32 with your "peripheral.py" returns a message as in the pictures, while the "basic_ble.py" activates the advertising, connects and communicates with "serial bluetooth terminal" app on the phone.
I am searching for "notify a close-by ble device" which means using the esp32 periodically on scan/advertise mode without connection , preferably with rssi signal level upon detection.
could you help me , please, understand what is the nature of the error, so I can switch between the 2 modes with time sharing?
``
the esp32 dev board is a basic board, nothing fancy, "Lolin D32"
---code---- basic_ble.py
boot section
import esp
import esp32
import micropython
from micropython import const
import machine
from machine import Pin,I2C,SoftI2C,ADC,Timer
import utime
import time
from time import sleep_ms
import struct
import random
import network
import ubluetooth
from ubluetooth import BLE
adcamp1=ADC(Pin(32))
adcamp2=ADC(Pin(33))
adcamp3=ADC(Pin(34))
adcbat=ADC(Pin(35))
led=Pin(2,Pin.OUT) # pin 2 in devkit1
machine.freq(240000000)
#------------------------------------------
class BLE(): # BLE class
def init(self, name):
self.name = name
self.ble = ubluetooth.BLE()
self.ble.active(True)
self.led=led
self.timer1 = Timer(0)
self.timer2 = Timer(1)
self.disconnected()
self.ble.irq(self.ble_irq)
self.register()
self.advertiser()
def connected(self):
self.timer1.deinit()
self.timer2.deinit()
def disconnected(self):
self.timer1.init(period=1000, mode=Timer.PERIODIC, callback=lambda t: self.led(1))
sleep_ms(10)
self.timer2.init(period=1000, mode=Timer.PERIODIC, callback=lambda t: self.led(0))
def ble_irq(self, event, data):
if event == 1:
'''Central disconnected'''
self.connected()
self.led(1)
elif event == 2:
'''Central disconnected'''
self.advertiser()
self.disconnected()
elif event == 3:
'''New message received'''
buffer = self.ble.gatts_read(self.rx)
message = buffer.decode('UTF-8').strip()
print(message)
if message == 'led':
led.value(not led.value())
print('led', led.value())
ble.send('led' + str(led.value()))
if message=='hmc':
magdat=adc_loop()
ble.send(str(magdat))
def register(self):
# Nordic UART Service (NUS)
NUS_UUID = '6E400001-B5A3-F393-E0A9-E50E24DCCA9E'
RX_UUID = '6E400002-B5A3-F393-E0A9-E50E24DCCA9E'
TX_UUID = '6E400003-B5A3-F393-E0A9-E50E24DCCA9E'
BLE_NUS = ubluetooth.UUID(NUS_UUID)
BLE_RX = (ubluetooth.UUID(RX_UUID), ubluetooth.FLAG_WRITE)
BLE_TX = (ubluetooth.UUID(TX_UUID), ubluetooth.FLAG_NOTIFY)
BLE_UART = (BLE_NUS, (BLE_TX, BLE_RX))
SERVICES = (BLE_UART, )
((self.tx, self.rx,), ) = self.ble.gatts_register_services(SERVICES)
def send(self, data):
utime.sleep(0.001)
self.ble.gatts_notify(0, self.tx, data + '\n')
def advertiser(self):
name = bytes(self.name, 'UTF-8')
self.ble.gap_advertise(100, bytearray('\x02\x01\x02') + bytearray((len(name) + 1, 0x09)) + name)
#----------------------------------------
def adc_loop():
amp1 =adcamp1.read()
amp1=amp1+1000
amp2 =adcamp2.read()
amp2=amp2+1000
amp3 =adcamp3.read()
amp3=amp3+1000
bat =adcbat.read()
bat=bat+1000
magdat=[amp1]+[amp2]+[amp3]+[bat]
print(magdat)
return magdat
#--------------------------------------------------------
if name == 'main':
ble = BLE('hmc001')