MicroPython

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  simple mqtt and wss
  mqtt wss • • tttadam  

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  @tttadam Did you try this? https://gist.github.com/ccooper21/cf956344c0a1428a0c1a9aa71edd4205
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  Timer.Alarm nested in another Timer.Alarm possible?
  • railmonitor  

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  @railmonitor You do not need the lamda function for setting the callback. Simply giving the name of the callback function is sufficient. Timer.Alarm(timer_sampler, s = 1, periodic = True) Obviously, the function timer_sampler has to be placed in your script before using if for the alarm callback notification, and the callback has to have a single argument, the alarm object.
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  Convert string to integer
  python • • misterlisty  

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  @robert-hh said in Convert string to integer: binascii.hexlify("\x12") On my gpy binascii.hexlify("\x12") gives b'12' Rob. How come I get bytes but you get a hex string?
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  Wipy pin Vin
  • ciccio  

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  @ciccio vin is the pin to supply the WiPy. When the module is attached e.g. to the expansion board, you can of course take power at that pin for other devices. But the WiPy is not the source of that power.
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  queue, double put blocks code
  • Doroana  

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  @Doroana, not sure if you have figured this out yet but when you create your instance of the queue, you can give it a parameter of the size of the queue. a = queue.Queue(10), this will create a queue with max size 10. The default value is 1.
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  Scheduling Tasks
  • joglekar.omkar  

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  You can create a timer chrono / alarm instance using the following API: https://docs.pycom.io/firmwareapi/pycom/machine/timer/
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  Camera image over MQTT
  low power • • robmarkcole  

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  @jcaron Dear Jcaron: Tnx for your reply. Sorry, if I couldn't make it clear. But, I now I have made it to sending a few hundreds of bytes now (upto 1KB). As soon as I am done with the final project, I will share my updates.
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  Communication with other lora device doesn't work
  bugs lora lopy4 feather m0 • • melkoutch  

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  @melkoutch hope you still read this as this thread is quite old. I stumbled upon it having the exact same problem (LoPy4 <-> Feather M0 in raw LoRa). Adjusting the spreading factor doesn't seem to solve it for me. Would you be able to post the code fragment that you used to successfully connect the two? Thanks a lot!
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  How to save Strings from UART the right way
  uart data strings • • SciWax  

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  @robert-hh Thank you so much for that input! I'm really new to Python in regards of MCU's, so there is still alot to learn for me. Now I'm less afraid, that something could go wrong. :)
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  Modbus Slave on MicroPython/LoPy4
  • supergumby  

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  Thanks. I did find that post when doing my initial searching. Before finding Pycom I was looking at just doing things in C on some other embedded processor like TI or NXP. Maybe I just didn't look hard enough, but I was surprised that they didn't have native canned Modbus libraries. Most people end up using FreeMODBUS ( https://www.embedded-experts.at/en/freemodbus/about/ ). This just blows me away since Modbus is the universal standard in industrial automation. Then I found the LoPy4 with a Modbus library and all the other communications libraries I wanted, too. Only to find out it is not a complete implementation. It would have been such a time saver if it was. uModbus looks promising. In fact, it looks like the pycom library imports from it. Looks like there is a port of FreeMODBUS for the ESP32 if anyone wants to go wading in C code ( https://github.com/espressif/esp-idf/tree/c77c4ccf6c43ab09fd89e7c907bf5cf2a3499e3b/examples/protocols/modbus ). Python is so much faster and easier, so I would prefer not to.
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  Sending json data through MQTT
  • DBA10  

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  NB-IoT: How to send data in Non-IP mode
  lte nb iot non-ip • • stsiafak  

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  Hi @stsiafak Just curious, were you able to send the data using non-IP mode? Also, how did you get the packet into wireshark?
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  Importing Library
  • Edward Dimmack  

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  Took more time than planned. Voilá, more community Pycom MicroPython firmwares, including : 24 firmwares without ulab, in combinations of 6 xxPy boards, Pybytes or not, single/double precision; 21 firmwares with ulab, in combinations of 6 xxPy boards, Pybytes or not, single/double precision. 3 LoPy/SiPy/WiPy firmwares with ulab and Pybytes combinations are not possible due to the small firmware partition size of these boards. These firmwares with ulab have 'MICROPY_PY_REVERSE_SPECIAL_METHODS' enabled to allow '1 + np.arange(10)', for example. Announce with more details in 'Pycom firmwares with single/double precision and ulab module' topic.
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  UART Reading
  • Oridroo  

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  The error is self-explanatory. You are trying to subscript an object which you think is a list or dict, but actually is None. This means that you tried to do: None[something] This error means that you attempted to index an object that doesn't have that functionality. You might have noticed that the method sort() that only modify the list have no return value printed – they return the default None. 'NoneType' object is not subscriptable is the one thrown by python when you use the square bracket notation object[key] where an object doesn't define the getitem method . This is a design principle for all mutable data structures in Python.
• T

  Ghost watchdog
  micropython pybytes watchdog • • tttadam  

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  sadly it's the same... rst:0x7 (TG0WDT_SYS_RESET),boot:0x37 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:1 load:0x3fff8020,len:8 load:0x3fff8028,len:2140 ho 0 tail 12 room 4 load:0x4009fa00,len:19760 entry 0x400a05bc
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  Anyone have a reliable MQTT interface using PyCom?
  • netskink  

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  Hi @netskink, Yes this is part of Pybytes, but you can use the MQTT without integrating with pybytes, I mean you can use the library instead of umqtt.py In your case what you should use is only: mqtt_core.py msg_handl.py the try-catch is related to libraries under the "lib" folder and in the frozen zone. so if you are using your own firmware, you can just add the above files and ignore the try-catch or remove them. if you are using pybytes firmware, you can import mqtt.py or _mqtt.py and do subscribe, publish directly.
• B

  I2C Clock Stretching
  • brotherdust  

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  @Strevens great you got it to work. If you have time, could you please take a look at my topic at the following: https://forum.pycom.io/topic/6141/scd30-oserror-i2c-bus-error
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  Define WLAN/Bluetooth frequency
  • Miksteri  

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  How to measure time in miliseconds?
  • dabal221  

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  You could use the rtc.now(), that one contains microsecounds.
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  Pycom board emulator
  • PG  

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  I am guessing not...these forums don't really seem to active. I was looking for something similar, which would definitely come in handy when emulating LTE connections. Waiting for a 10+ min attach to find an error in code really slows things down.