MicroPython

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  Camera image over MQTT
  low power • • robmarkcole  

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  @smzk2001 NB-IOT is barely better than LoRa. With a peak rate of 26 kbits/s, it’s going to take forever to transmit a picture. Exactly how long will depend a lot on the resolution, number of channels (i.e. grayscale vs colour), depth (number of bits per channel), compression, nature of the image... A very basic 640 x 480 black and white (literally: 1 bit per pixel, not grayscale) uncompressed picture will take over 10 seconds to transmit. A 2 megapixels 24-bit colour picture, uncompressed, will take half an hour. Even if compressed, it will take minutes. Higher resolution pictures will quickly take hours. NB-IOT is definitely not designed for this purpose. Cat-M1 would be barely better. Depending on your exact application (picture parameters as described above, frequency or frame rate...), you’ll have to either switch to a much higher bandwidth technology (“full” LTE, WiFi...) or if relevant switch to local processing of the image to send only the result of the processing (e.g. “a move was detected” or “3 people were present”) rather than the image itself. Of course, in either case, battery life will quickly become an issue.
• S

  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
• N

  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.
• N

  Interactive console with operational code
  • netskink  

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  @netskink said in Interactive console with operational code: I've worked with esp32 in C and there is a capability where you can add a console component to your esp32 C app. Given that C is a compiled language, this is hard to understand for me. So I assume it's some kind of firmware/application package which is running in the device. Still, the ESP32 does not have a general purpose Operating System. If you want to have the Python console while an application code is running, you can start that application in a new thread and terminate the thread which started it. Then you will get the REPL prompt again. But this is not general multitasking, just a method to run several tasks at the same time.
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  UART
  • loics  

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  Solved : turns out I needed a USB<->TTL and not an USB<->RS232... I did not know about the TTL standard, as I did not study eletronics at all. Gotta learn the hard way !
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  Digital Signatures / ECC
  • mki64  

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  Digital Signatures / ECC No, I have to communicate with a secure device that requires ECC to establish a shared AES key. I am trying to covert the library: https://github.com/starkbank/ecdsa-python Having to convert recursive functions. Wondering if there is an easier (faster) way.
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  This topic is deleted!
  • panda  

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  Wrong dates on files saved to SD card
  • railmonitor  

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  @railmonitor said in Wrong dates on files saved to SD card: I seems that the filesystem is using an "epoch" date of 1st of january 2000. But how can i happen that it's giving me dates from newyearseve 1999? MicroPython does not care for timezones. It always assumes UTC. Since you PC does know timezones, there can be differences of a few hours. And unless you set the time of your FiPy properly, the time stamp value will start January 1st, 2000 on every boot. The Linux epoch time is January 1st, 1970. That may cause the 30 years difference. So it looks like the compensation for the epoch times difference is applied twice. May I ask you to raise an issue. That ensures that this glitch does not get lost and will eventually be fixed.
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  Changing runtime parameter on timer class
  lopy4 micropython • • berryskies  

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  Verify Signature
  • mthethwansm  

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  Do you know how now？😂 I have the same question as you.
• J

  Translate Arduino code to microPython
  micropython arduino issues • • JHN  

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  @Gijs Hello! that pin are not needed, infact my code is working, one hardware pin "p2" had some issue, it is constant 3.3V which means that the ploadPin are not toggled. The code awill hopefully be uploaded on Git!