New Firmware Release Candidate v1.20.0





  • Actually that error is not related to writing a file. I am not sure what is causing it. It does not appear to happen in direct response to any particular user scripts/code, but in safe mode it is not an issue.



  • @reidfo Same here for the Windows updater. LittleFS option is there, but it does not work.

    That issue aside, Writing to files I now get an unexpected error at random times:

    ASSERT_PARAM(2051 0), in llc_util.c at line 289



  • @crumble While I don't know about the first issue, I have seen the second. For me, on MacOS, it seems like I saw the option for LittleFS in the updater (or maybe I'm imagining it) but now I don't. To get LittleFS I have compiled the firmware myself.



  • How can I check the type of the file system.
    I flashed the firmware under Win10 with update tool 1.15.2.b1

    The last update of 1.19.0.b_ on a Lopy with LIttleFS setting showed me on boot up that LittleFS is used. Now it shows me FatFS.

    I tried a second upgrade with reformat checkbox set and it is still showing:

    Autoconnect: Found a PyCom board on USB
    Autoconnect: Connecting on COM3...
    Initializing filesystem as FatFS!
    


  • @iwahdan

    Why shall we wait for all the inits? Waiting seems not to be a reliable method for the pytrack. We need methods to check if a module is ready or wait for a init signal.

    #main.py
    [... a lot of includes of internal and *mpy modules ...]
    
    _startup_ticks = utime.ticks_ms()
    
    [... do some init stuff like WiFi and NTP ...]
    
    _wait_init = 3000 - utime.ticks_diff(utime.ticks_ms(),  _startup_ticks)
    if _wait_init > 0:
        print('waiting')
        utime.sleep_ms(_wait_init)
    print(_wait_init)
    
    #time.sleep(1)
    py = Pytrack()
    print('done init pytrack')
    

    will fail somtimes if wait time is 2000ms. Even 3000ms is to short. Sometimes t fails like usualy with i2c errors, once it never returned from Pytrack()

    I give now 4500ms a try. It will be hard to trust the settings.



  • @reidfo
    As an alternative to built-in NTP sync implementation you may use this simple code:

    NTP_QUERY = bytearray(48)
    NTP_QUERY[0] = 0x1b				
    addr = socket.getaddrinfo(<NTP_SERVER>, 123)[0][-1]
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s.settimeout(3) #optional
    res = s.sendto(NTP_QUERY, addr)
    msg = s.recv(48)
    s.close()
    val = struct.unpack("!I", msg[40:44])[0] - 2208988800 # 70 years difference between NTP and Pycom epoch
    tm = time.localtime(val)
    self.rtc.init(tm)
    

    Don't forget to implement handling of socket exceptions.



  • @iwahdan
    OK, are you able to simulate deteriorating radio conditions/packet loss? In my opinion it is necessary to perform tests in conditions which are close to limits of modulation/modem capabilities.

    Some LTE-related questions:

    1. Does current NB-IoT firmware for Sequans modem support all Coverage Extension modes?
    2. If so, how exactly is the switch between EC0, EC1 and EC2 performed?
    3. What are the EC mode switch thresholds for the Sequans modem? The algorithm should be based on RSRP value, or am I wrong?
    4. Is it necessary to trigger re-attach from application code in case of EC mode change?


  • This code seems to be running okay on a FIPY, with the exception of rtc.ntp_sync(). As was noticed a while back in [this thread]](https://forum.pycom.io/topic/1414/i-swore-i-had-rtc-ntp_sync-working-on-my-lopy-and-now-i-can-t-get-it-working-at-all/2), after a soft reset (i.e. after uploading code from Pymakr) the RTC won't sync. I added a check for this and machine.reset() to my code, but it still won't sync after that. I have to physically hit the reset button on the FIPY before the clock will sync again.



  • @danielm ok, i’ll Run your code tomorrow on our NB-IoT emulator in the office to try to see where is the problem



  • @iwahdan
    Here is updated test code v4:
    https://drive.google.com/open?id=1RPJlMgWEqe_eMwWZEvPhof2E_Qpo1s1v

    Changes:

    • added 2s sleep time before LTE init
    • disabled WDT
    • ussl.wrap_socket() in urequests with defined timeout parameter
    • auto restart after 8 HTTPS requests

    Issues:

    • rare LTE init hang (In my opinion a timeout should be implemented for lte.init() as well)
    • when modem synchro state goes to OFF (why???), lte.isattached() and lte.isconnected() remain True and this state continues until next HARD reset (including modem reset):
    rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (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:0x3fff8028,len:8
    load:0x3fff8030,len:1984
    load:0x4009fa00,len:0
    load:0x4009fa00,len:19088
    entry 0x400a05e4
    Initializing filesystem as FatFS!
    INFO Starting initialization of LTE
    INFO LTE initialized
    LTE is attached after init: True
    LTE is connected after init: False
    INFO Attached to LTE network
    INFO LTE connect command sent
    INFO Connected to LTE network
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-96.24dBm RSRQ:-14.63dB
    INFO 1. HTTP POST successful: {"args":{},"data":{"time":"15"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"14","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"15"},"url":"https://54.234.238.118/post"} (duration: 23s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-96.90001dBm RSRQ:-15.2dB
    WARNING 2. HTTP POST failed: -26624 (duration: 17s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-98.25dBm RSRQ:-15.95dB
    INFO 3. HTTP POST successful: {"args":{},"data":{"time":"75"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"14","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"75"},"url":"https://54.234.238.118/post"} (duration: 15s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-97.04dBm RSRQ:-15.45dB
    INFO 4. HTTP POST successful: {"args":{},"data":{"time":"100"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"15","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"100"},"url":"https://54.234.238.118/post"} (duration: 16s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-97.40001dBm RSRQ:-15.8dB
    WARNING 5. HTTP POST failed: -26624 (duration: 14s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-96.84dBm RSRQ:-15.1dB
    INFO 6. HTTP POST successful: {"args":{},"data":{"time":"144"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"15","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"144"},"url":"https://54.234.238.118/post"} (duration: 14s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-97.61001dBm RSRQ:-15.41dB
    WARNING 7. HTTP POST failed: -26624 (duration: 14s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-95.44dBm RSRQ:-14.55dB
    INFO 8. HTTP POST successful: {"args":{},"data":{"time":"186"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"15","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"186"},"url":"https://54.234.238.118/post"} (duration: 18s)
    Restarting...
    ets Jun  8 2016 00:22:57
    
    rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (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:0x3fff8028,len:8
    load:0x3fff8030,len:1984
    load:0x4009fa00,len:0
    load:0x4009fa00,len:19088
    entry 0x400a05e4
    Initializing filesystem as FatFS!
    INFO Starting initialization of LTE
    INFO LTE initialized
    LTE is attached after init: True
    LTE is connected after init: False
    INFO Attached to LTE network
    INFO LTE connect command sent
    INFO Connected to LTE network
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-96.48dBm RSRQ:-15.11dB
    INFO 1. HTTP POST successful: {"args":{},"data":{"time":"15"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"14","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"15"},"url":"https://54.234.238.118/post"} (duration: 16s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-96.67dBm RSRQ:-14.58dB
    WARNING 2. HTTP POST failed: -26624 (duration: 15s)
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    WARNING 3. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    WARNING 4. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    WARNING 5. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    WARNING 6. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    WARNING 7. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    WARNING 8. HTTP POST failed: timed out (duration: 10s)
    Restarting...
    ets Jun  8 2016 00:22:57
    
    rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (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:0x3fff8028,len:8
    load:0x3fff8030,len:1984
    load:0x4009fa00,len:0
    load:0x4009fa00,len:19088
    entry 0x400a05e4
    Initializing filesystem as FatFS!
    INFO Starting initialization of LTE
    INFO LTE initialized
    LTE is attached after init: True
    LTE is connected after init: False
    INFO Attached to LTE network
    INFO LTE connect command sent
    INFO Connected to LTE network
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    WARNING 1. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    WARNING 2. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:OFF RSRP:-2.147484e+07dBm RSRQ:-17.19dB
    

    Another type of connection failure - Synchro state is CELL_ACQUIRED, RSRP and RSRQ at acceptable levels, but HTTPS request always fails. It always timeouts after 10s (timeout defined for socket and ssl operations) therefore I believe that failing operation is socket.connect(). After hard reset the connection starts working again.

    rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (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:0x3fff8028,len:8
    load:0x3fff8030,len:1984
    load:0x4009fa00,len:0
    load:0x4009fa00,len:19088
    entry 0x400a05e4
    Initializing filesystem as FatFS!
    INFO Starting initialization of LTE
    INFO LTE initialized
    LTE is attached after init: True
    LTE is connected after init: False
    INFO Attached to LTE network
    INFO LTE connect command sent
    INFO Connected to LTE network
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-96.16dBm RSRQ:-14.57dB
    WARNING 1. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-95.78dBm RSRQ:-14.1dB
    WARNING 2. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-95.22dBm RSRQ:-13.86dB
    WARNING 3. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-95.22dBm RSRQ:-13.99dB
    WARNING 4. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-94.98dBm RSRQ:-14.12dB
    WARNING 5. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-95.23dBm RSRQ:-14.06dB
    WARNING 6. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-95.25001dBm RSRQ:-14.09dB
    WARNING 7. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.96dBm RSRQ:-13.97dB
    WARNING 8. HTTP POST failed: timed out (duration: 10s)
    Restarting...
    ets Jun  8 2016 00:22:57
    
    rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (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:0x3fff8028,len:8
    load:0x3fff8030,len:1984
    load:0x4009fa00,len:0
    load:0x4009fa00,len:19088
    entry 0x400a05e4
    Initializing filesystem as FatFS!
    INFO Starting initialization of LTE
    INFO LTE initialized
    LTE is attached after init: True
    LTE is connected after init: False
    INFO Attached to LTE network
    INFO LTE connect command sent
    INFO Connected to LTE network
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.3dBm RSRQ:-13.63dB
    WARNING 1. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-94.2dBm RSRQ:-13.46dB
    WARNING 2. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.72001dBm RSRQ:-13.85dB
    WARNING 3. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-95.63dBm RSRQ:-14.87dB
    WARNING 4. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-95.43dBm RSRQ:-14.86dB
    WARNING 5. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-94.25dBm RSRQ:-13.74dB
    WARNING 6. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-94.55dBm RSRQ:-14.13dB
    WARNING 7. HTTP POST failed: timed out (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.21dBm RSRQ:-13.11dB
    WARNING 8. HTTP POST failed: timed out (duration: 10s)
    Restarting...
    ets Jun  8 2016 00:22:57
    
    rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (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:0x3fff8028,len:8
    load:0x3fff8030,len:1984
    load:0x4009fa00,len:0
    load:0x4009fa00,len:19088
    entry 0x400a05e4
    Initializing filesystem as FatFS!
    INFO Starting initialization of LTE
    INFO LTE initialized
    LTE is attached after init: True
    LTE is connected after init: False
    INFO Attached to LTE network
    INFO LTE connect command sent
    INFO Connected to LTE network
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-92.36dBm RSRQ:-13.48dB
    WARNING 1. HTTP POST failed: timed out (duration: 10s)
    
    ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
    
    Session stopped
        - Press <return> to exit tab
        - Press R to restart session
        - Press S to save terminal output to file
    
    Error reading from serial device
    INFO LTE initialized
    LTE is attached after init: False
    LTE is connected after init: False
    INFO LTE attach command sent (band:20 APN:nbiot.telekom.sk)
    LTE Attached:False Connected:False Synchro state:OFF RSRP:0.0dBm RSRQ:0.0dB
    LTE Attached:False Connected:False Synchro state:CELL_SEARCH RSRP:0.0dBm RSRQ:0.0dB
    LTE Attached:False Connected:False Synchro state:MIB_DETECT RSRP:-93.55dBm RSRQ:-13.73dB
    LTE Attached:False Connected:False Synchro state:RSRP RSRP:-97.54001dBm RSRQ:-16.78dB
    LTE Attached:False Connected:False Synchro state:CELL_SEARCH RSRP:-2.147484e+07dBm RSRQ:-16.39dB
    LTE Attached:False Connected:False Synchro state:SIB1_ACQ RSRP:-93.1dBm RSRQ:-14.82dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.0dBm RSRQ:-14.31dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.54001dBm RSRQ:-13.61dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.72dBm RSRQ:-13.49dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.7dBm RSRQ:-13.33dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.74dBm RSRQ:-13.24dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.76999dBm RSRQ:-13.26dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.69dBm RSRQ:-13.26dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.79dBm RSRQ:-13.3dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.75001dBm RSRQ:-13.2dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.5dBm RSRQ:-14.4dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.08dBm RSRQ:-14.03dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.65dBm RSRQ:-13.66dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.40001dBm RSRQ:-13.32dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.31dBm RSRQ:-13.24dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.41dBm RSRQ:-13.28dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.45dBm RSRQ:-13.28dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-92.76999dBm RSRQ:-13.36dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.13dBm RSRQ:-13.63dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.25dBm RSRQ:-13.68dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.3dBm RSRQ:-13.71dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.21dBm RSRQ:-13.51dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.21dBm RSRQ:-13.47dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.13dBm RSRQ:-13.49dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.11999dBm RSRQ:-13.57dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.11dBm RSRQ:-13.64dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.18999dBm RSRQ:-13.76dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.18999dBm RSRQ:-13.75dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.34dBm RSRQ:-13.79dB
    LTE Attached:False Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.27dBm RSRQ:-13.72dB
    LTE Attached:True Connected:False Synchro state:CELL_ACQUIRED RSRP:-93.18dBm RSRQ:-13.64dB
    INFO Attached to LTE network
    INFO LTE connect command sent
    INFO Connected to LTE network
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.09dBm RSRQ:-13.31dB
    INFO 1. HTTP POST successful: {"args":{},"data":{"time":"34"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"14","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"34"},"url":"https://54.234.238.118/post"} (duration: 13s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.38dBm RSRQ:-13.57dB
    INFO 2. HTTP POST successful: {"args":{},"data":{"time":"56"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"14","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"56"},"url":"https://54.234.238.118/post"} (duration: 12s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-92.95dBm RSRQ:-13.43dB
    INFO 3. HTTP POST successful: {"args":{},"data":{"time":"78"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"14","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"78"},"url":"https://54.234.238.118/post"} (duration: 11s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-94.05dBm RSRQ:-14.2dB
    INFO 4. HTTP POST successful: {"args":{},"data":{"time":"98"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"14","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"98"},"url":"https://54.234.238.118/post"} (duration: 12s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.47dBm RSRQ:-13.76dB
    INFO 5. HTTP POST successful: {"args":{},"data":{"time":"120"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"15","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"120"},"url":"https://54.234.238.118/post"} (duration: 10s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-92.95dBm RSRQ:-13.53dB
    INFO 6. HTTP POST successful: {"args":{},"data":{"time":"140"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"15","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"140"},"url":"https://54.234.238.118/post"} (duration: 11s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.71dBm RSRQ:-13.73dB
    INFO 7. HTTP POST successful: {"args":{},"data":{"time":"160"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"15","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"160"},"url":"https://54.234.238.118/post"} (duration: 13s)
    LTE Attached:True Connected:True Synchro state:CELL_ACQUIRED RSRP:-93.46dBm RSRQ:-13.82dB
    INFO 8. HTTP POST successful: {"args":{},"data":{"time":"182"},"files":{},"form":{},"headers":{"x-forwarded-proto":"https","host":"54.234.238.118","content-length":"15","accept":"application/json","content-type":"application/json","x-forwarded-port":"443"},"json":{"time":"182"},"url":"https://54.234.238.118/post"} (duration: 11s)
    Restarting...
    


  • @robert-hh
    Yes, I already found out but I did not get any response from the modem when initialized on bus 1. MP does not allow to initialize on bus 2.


  • Global Moderator

    @danielm The UART runs at 921600 Baud, 8N1 for the other parameters..



  • @iwahdan
    This code in main.py runs for 10 minutes without any hang:

    import machine
    import network
    import time
    time.sleep(2)
    lte = network.LTE()
    print("LTE initialized")
    lte.deinit()
    print("LTE deinitialized")
    machine.reset()
    


  • @danielm can you try with putting a sleep time of 1-2 sec before LTE init



  • @iwahdan
    This code in main.py will hang eventually:

    import machine
    import network
    lte = network.LTE()
    print("LTE initialized")
    machine.reset()
    

    This code in main.py will hang in few rounds:

    import machine
    import network
    lte = network.LTE()
    print("LTE initialized")
    lte.deinit()
    print("LTE deinitialized")
    machine.reset()
    

    I believe we are facing some timing issues. Firmware is always able to trigger safe-boot reset using Ctrl-F. Tested with NB1-40343.



  • @robert-hh
    In our application we are resetting the modem with 'AT+CFUN=1,1' command after each boot. Anyway for that the LTE object must be already initialized.

    A workaround might be to initialize UART object on LTE_RX and LTE_TX pins but I did not try that yet and I am not sure if it will be allowed by Pycom MicroPython.

    EDIT: It seems that it is possible to init UART object using P20 and P18, but I am not sure what UART parameters to set. Probably can be found in modlte.c and included files.

    In normal situation I would prefer to avoid resetting the modem as it can be already attached operating in eDRX or PSM mode. However the LTE.init() must work reliably first.


  • Global Moderator

    @danielm SOft reset does not reset the LTE modem. A subsequent LTE() fails for me.
    The changed cttrl-f behaviour allows to disable safe boot via ctrl-f in case you need it.



  • @robert-hh
    It seems that you don't have issues with LTE object initialization (network.LTE())?
    Could you please try to run the code from my previous post and perform several soft-resets? There are some LTE stats included as well.

    Btw longest attach I experienced ever was about 5mins long. Usually it takes only several seconds and I am testing in an area with not optimal conditions. It seems the duration really depends on conditions in specific network.

    What is the proposed change of CTRL-F behavior?


  • Global Moderator

    @iwahdan Thanks. It works with LTE on band 8. One observation, which others made before too, IIRC. The first attach after power on takes almost forever, like 15 minutes. the subsequent attaches are fast, as long as power is maintained. Another LTE modem I have behaves different. Their first attach also takes long, but on subsequent power cycles attaching stays fast, within a second.

    Unrelated note: The py/modmicropython.c change for ctrl-f handling is not yet included.


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