Navigation

    M5Stack Community

    • Register
    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Search
    1. Home
    2. rfaass
    R
    • Continue chat with rfaass
    • Start new chat with rfaass
    • Flag Profile
    • Profile
    • Following
    • Followers
    • Blocks
    • Topics
    • Posts
    • Best
    • Groups
    Save
    Saving

    rfaass

    @rfaass

    0
    Reputation
    6
    Posts
    401
    Profile views
    0
    Followers
    0
    Following
    Joined Last Online

    rfaass Follow

    Posts made by rfaass

    • RE: ATOM-DTU-NB-IOT no connect to sim7020

      @felmue USA... and I ordered t-mobile,, should be in later this week, there is a lot of snow here. I also asked Soracom, but they told me it will not work here... I'll keep you posted. I really like the Atom DTU; there could be a more global modem in there... or perhaps a few to choose from.

      posted in Arduino
      R
      rfaass
    • RE: ATOM-DTU-NB-IOT no connect to sim7020

      @felmue It seems that this M5Stack ATOM DTU is not very usable in only a few countries as this overview:
      https://developers.soracom.io/en/docs/reference/carriers/ shows very few countries support NB-IOT;
      looking for a modem now that supports LTE-Cat M1 as that is more a global solution. Bummer, as I really like the form factor combined with the RS485 interface; perhaps another modem in the future? I ordered a sim card from T-Mobile for NB-IOT (took me a better part of ther day, I'll report back how that goes; according to their business web site they are the leader in NB-IOT; hopeful.

      posted in Arduino
      R
      rfaass
    • RE: ATOM-DTU-NB-IOT no connect to sim7020

      @felmue Got hologram not to work yet, it does see a number of providers but does not register, I asked support @hologram. They had a special for sim7000 but that is not compatible with the 7020G.. bummer. I bought another sim, now Soracom, arriving Tuesday, hope that goes better... I studied up on MQTT though and have that knowledge now, ready to deploy ;-)

      posted in Arduino
      R
      rfaass
    • RE: ATOM-DTU-NB-IOT no connect to sim7020

      @felmue Using Hologram, from my research the best, have good signal but no ip communication yet, I am a weekend warrior ;-)

      posted in Arduino
      R
      rfaass
    • RE: ATOM-DTU-NB-IOT no connect to sim7020

      @felmue thank you for your help.

      I found my problem, very basic first line should read:

      Serial2.begin(115200, SERIAL_8N1, G19, G22); //TX to RX and RX to TX

      I first wanted to have basic access to AT commands, making sure my sim card was inserted correctly, what my signal strength is, setting of my APN, etc. I used to program in assembler, after that higher language and checking the compiler output... I like to know what is actually happening.

      By the way, I used PuTTY as my terminal emulator as it works better than the IDE from Arduino for this purpose, Arduino composes a line before transmitting and PuTTY does it each character as you type. Also, the reset connection works like a charm if disconnected.

      (yes, the way the sim card needs to go in is opposite of normal, the slant corner on the outside and the contacts up.)

      posted in Arduino
      R
      rfaass
    • ATOM-DTU-NB-IOT no connect to sim7020

      program I use to connect to the sim7020:

      #include <HardwareSerial.h>

      void setup() {
      // put your setup code here, to run once:
      Serial.begin(115200);
      // set the data rate for the HardwareSerial port
      //Serial2.begin(115200);
      Serial2.begin(115200, SERIAL_8N1, G22, G19);
      }

      void loop() {
      if (Serial2.available()) {
      Serial.write(Serial2.read());
      }
      if (Serial.available()) {
      Serial2.write(Serial.read());
      }
      }

      The program works when G19 and 22 are connected, but inserted I get no reply to AT.

      Powered with 24V made no difference, what to check? I also tried to change rx and tx but did not make a difference.

      TIA, Robert.

      posted in Arduino
      R
      rfaass