techstudio-design
commented
1 year ago If you don't mind, can you tell us which country you are in and carrier you are using(this give us better understanding of your network and technology)?
Your description of LED seems to suggest that the module is able to register to the network, but somehow you are not be able to communicate with the Module via serial port. Pin 16 and 17 on ESP32 is for Serial2 which is the default we used for allFunctions.ino, in fact we test most of examples using an ESP32. So yes, ESP32 should work "out of the box". APN is not necessary for NB-IoT unless you are connecting via older 3G technology.
Here is the suggestions that we could think of for isolating the root cause: 1) Sim7080G is operated on 1.8V power domain, and your MCU could be either 3.3V or 5V, we don't know what SIM7080G development board you have, but in general there is a level-shifter on the interface (including Serial port) between the MCU and the SIM7080G, and in most of the design, there is a level-shifter enable pin that need to be connected to either the 3.3V or 5V depend on your MCU operating voltage. This is board specific and we don't know all the boards design available in the market, especially those from the Chinese markets. But this is the first thing I could think of when unable to communicate with Serial port, assumed TX/RX are connected correctly. 2) Uncomment the #define DUMP_AT_COMMANDS of the example code and download the StreamDebugger library in order to be able to see all the AT Commands communication between the module and the MCU. 3) If you have an USB-TTL Adaptor, instead of running an Arduino sketch, you can connect directly to your SIM7080G development board and manually interacts with the SIM7080G using AT commands until you are sure it works first. We describe this in our Getting Started with TechStudio SIM7080 Development Board.
BTW, here is the data log for the communication between an ESP32 using Serial2 and our very own SIM7080G development board, using http_get example with StreamDebugger code add-in to replace the line SimpleNB modem(SerialAT);.
[63] Powering Up...
[3563] Communicate at baud rate 115200 ...
[6072] Initializing modem...
[6072] ### SimpleNB Version: 1.0.0
[6072] ### SimpleNB Compiled Module: SimpleNBClientSIM7080
AT
AT
OK
ATE0
ATE0
OK
AT+CMEE=2
OK
AT+GMM
SIMCOM_SIM7080
OK
AT+CLTS=1
OK
AT+CBATCHK=1
OK
AT+CPIN?
+CPIN: READY
OK
[6115] Waiting for network registration...
AT+CSQ
+CSQ: 22,99
OK
AT+CEREG?
+CEREG: 0,1
OK
[6132] Activate Data Network...
AT+CNACT=0,1
OK
+APP PDP: 0,ACTIVE
[7162] Connecting to postman-echo.com port 80
AT+CACLOSE=0
+CME ERROR: operation not allowed
AT+CACID=0
OK
AT+CASSLCFG=0,SSL,0
OK
AT+CAOPEN=0,0,"TCP","postman-echo.com",80
+CAOPEN: 0,0
OK
AT+CASEND=0,16
>GET /ip HTTP/1.1
OK
AT+CASEND=0,2
>
OK
AT+CASEND=0,22
>Host: postman-echo.com
OK
AT+CASEND=0,2
>
OK
AT+CASEND=0,17
>Connection: close
OK
AT+CASEND=0,2
>
OK
AT+CASEND=0,2
>
OK
AT+CARECV?
OK
AT+CASTATE?
+CASTATE: 0,1
OK
AT+CARECV?
OK
AT+CASTATE?
+CASTATE: 0,1
OK
+CADATAIND: 0
[8746] ### Got Data on socket: 0
+CASTATE: 0,0
[8750] ### Closed socket: 0
AT+CARECV?
+CARECV: 0,353
OK
AT+CASTATE?
+CASTATE: 0,0
OK
AT+CARECV=0,63
+CARECV: 63,HTTP/1.1 200 OK
Date: Tue, 06 Dec 2022 01:59:44 GMT
Content-T
OK
AT+CARECV?
+CARECV: 0,290
OK
AT+CASTATE?
+CASTATE: 0,0
OK
AT+CARECV=0,63
+CARECV: 63,ype: application/json; charset=utf-8
Content-Length: 22
Conne
OK
AT+CARECV?
+CARECV: 0,227
OK
AT+CASTATE?
+CASTATE: 0,0
OK
AT+CARECV=0,63
+CARECV: 63,ction: close
ETag: W/"16-PVkhkwm67Ps7Z9YKW1v+BVifcgw"
Vary: A
OK
AT+CARECV?
+CARECV: 0,164
OK
AT+CASTATE?
+CASTATE: 0,0
OK
AT+CARECV?
+CARECV: 0,164
OK
AT+CASTATE?
+CASTATE: 0,0
OK
AT+CARECV=0,63
+CARECV: 63,ccept-Encoding
set-cookie: sails.sid=s%3A7Hr2ub2Xx_dyieIvhxHb9
OK
AT+CARECV?
+CARECV: 0,101
OK
AT+CASTATE?
+CASTATE: 0,0
OK
AT+CARECV=0,63
+CARECV: 63,e8I6kkp5etW.Hg%2FE2GS22RgvGcKzoVW4ZnTtJaAAH8ReKwaJc9NG9ag; Path
OK
AT+CARECV?
+CARECV: 0,38
OK
AT+CASTATE?
+CASTATE: 0,0
OK
AT+CARECV=0,38
+CARECV: 38,=/; HttpOnly
{"ip":"111.65.56.238"}
OK
AT+CARECV?
OK
AT+CASTATE?
+CASTATE: 0,0
OK
[9094] Your IP address is: xxx.xx.56.238
AT+CACLOSE=0
OK
[9104] Deactivate Data Network...
AT+CNACT=0,0
OK
[9119] Powering Down...
[10319] Done!Hope this will help.
jftaylorMn
[ x] I have read the Troubleshooting section of the ReadMe
What type of issues is this?
[ ] Request to support a new module
[ ] Bug or problem compiling the library [ ] Bug or issue with library functionality (ie, sending data over TCP/IP) [ x] Question or request for help
What are you working with?
Modem: SImcon 7080G Main processor board: ESP32 SimpleNB version: latest Code: AllFunctionsTest
Scenario, steps to reproduce
Maybe this is just a request to improve the readme file...
I have very high hopes for this implementation of TinyGSM, but am stuck before any real testing can happen. Using an ESP32 "DevKitC" Development board in conjunction with a 7080G development board (with separate power supply). When running the AllFunctionsTest script, I see the modem is responding to the power pulldown, and changes form a quick flash to "connected" (once per 3 seconds) flash. The cellular provider is seeing "zero byte" connections, which suggests that the modem has basic communications. But nothing is successful after that.
[19] Powering Up... [3519] Communicate at baud rate 38400 ... [13619] No response from modem, check your hardware connection [24623] Failed to initialize modem, delaying 10s and retrying forever...
From the message, it appears that I don't know what pins to connect for rx and tx. I understand that rx on the mcu should connect to the tx on the modem and vice versa. I have tried GPIO 1 and 3, 16 and 17 in various combinations without luck. I have entered the APN into the script, but don't think we are where that will matter.
I have not done anything with serial communications on the ESP32 before - except for using the serial monitor in the Arduino IDE. From what I can tell, the ESP32 can use HardwareSerial to access the three different uarts. Before I dive deeper into the code, SHOULD this sketch work "out of the box" with ESP32?
Expected result
Connection to the cell modem would be established and selected tests would run
Actual result
"No response from modem, check your hardware connection"
Debug and AT command log
AT commands have not been entered yet. When I connect to the modem via USB, I get an "OK" when passing "AT" (as expected), so have no reason to suspect that the modem is bad.