LilyGO T-SIM7000G does not work with esp_modem

[takeshiba]

Dear all,

I am trying to use LilyGO T-SIM7000G with ESP-IDF 4.4.1 and latest esp_modem (it works with Arduino and TinyGSM library but is not reliable, that's why I am trying to move to ESP-IDF and esp_modem).

With SIM7000G esp_modem is not receiving reply to its `ATE0` command. Same code is working nicely with LilyGo T-CALL (based on SIM800), SIM800 and SIM7000G are similar and ESP32/Modem parts of the boards are the same. Same code is running without any modification under Arduino/TinyGSM.

I have tried many code for SIM7000G poweron/reset, with no luck with SIM7000G while OK with SIM800. I have extended delays as SIM7000G is initializing slower than SIM800.

I have set up a GITHUB repo with minimal code https://github.com/U03/esp_modem_test, works with SIM800 and not with SIM7000G.

In `DTE::command` it can be seen that `read_callback` is never called, would mean that either command is not received by SIM7000G or reply does not reach back ESP32.

This is driving me nuts anybody has any idea? Thanks in advance.

Code: [Select all] [Expand/Collapse]

1. command_result DTE::command(const std::string &command, got_line_cb got_line, uint32_t time_ms, const char separator)
2. {
3.     ESP_LOGD("TAG", "command     111");
4.     Scoped<Lock> l(lock);
5.     ESP_LOGD("TAG", "command     222");
6.     command_result res = command_result::TIMEOUT;
7.     ESP_LOGD("TAG", "command     333");
8.     command_term->set_read_cb([&](uint8_t *data, size_t len) {
9.         ESP_LOGD("TAG", "command     444");
10.  
11.         if (!data) {
12.             ESP_LOGD("TAG", "command     555");

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With SIM7000G leads to:

Code: [Select all] [Expand/Collapse]

1. V (21423) command_lib: set_echo
2. V (21423) command_lib: generic_command_common
3. V (21433) command_lib: generic_command
4. D (21433) command_lib: generic_command command ATE0
5. D (21433) TAG: command     111
6. D (21443) TAG: command     222
7. D (21443) TAG: command     333

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With SIM800 works fine:

Code: [Select all] [Expand/Collapse]

1. V (21434) command_lib: set_echo
2. V (21434) command_lib: generic_command_common
3. V (21444) command_lib: generic_command
4. D (21444) command_lib: generic_command command ATE0
5.  
6. D (21444) TAG: command     111
7. D (21454) TAG: command     222
8. D (21454) TAG: command     333
9. D (21464) TAG: command     444
10. D (21464) TAG: command     555
11. D (21464) TAG: command     777
12. D (21464) command_lib: Response:
13. OK

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[da_789]

Hi!

Did you finally solve it?
I am trying to get esp_modem working with Lilygo sim7000g so I can connect via LTE and receive GPS coordinates with AT commands.

[da_789]

I have an error when i try to build this project ( https://github.com/U03/esp_modem_test ):

Code: Select all

FAILED: sim7000g-esp_modem_T2.elf 
cmd.exe /C "cd . && C:\Espressif\tools\xtensa-esp32-elf\esp-2021r2-patch3-8.4.0\xtensa-esp32-elf\bin\xtensa-esp32-elf-g++.exe -mlongcalls -Wno-frame-address  @CMakeFiles\sim7000g-esp_modem_T2.elf.rsp -o sim7000g-esp_modem_T2.elf  && cd ."
c:/espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/esp_netif/libesp_netif.a(esp_netif_lwip_defaults.c.obj):C:/Espressif/frameworks/esp-idf-v4.4.2/components/esp_netif/lwip/esp_netif_lwip_defaults.c:52: undefined reference to `esp_netif_lwip_ppp_input'
c:/espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(main.c.obj):(.literal.app_main+0x30): undefined reference to `NETIF_PPP_STATUS'
c:/espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/espressif__esp_modem/libespressif__esp_modem.a(esp_modem_netif.cpp.obj):(.literal._ZN9esp_modem5Netif21esp_modem_post_attachEP13esp_netif_objPv+0x10): undefined reference to `esp_netif_ppp_get_params'
c:/espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/espressif__esp_modem/libespressif__esp_modem.a(esp_modem_netif.cpp.obj):(.literal._ZN9esp_modem5Netif21esp_modem_post_attachEP13esp_netif_objPv+0x14): undefined reference to `esp_netif_ppp_set_params'
c:/espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/espressif__esp_modem/libespressif__esp_modem.a(esp_modem_netif.cpp.obj): in function `esp_modem::Netif::esp_modem_post_attach(esp_netif_obj*, void*)':
C:/Users/dgoml/Desktop/TFM/ESP32/sim7000g-esp_modem_T2/managed_components/espressif__esp_modem/src/esp_modem_netif.cpp:60: undefined reference to `esp_netif_ppp_get_params'
c:/espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:/Users/dgoml/Desktop/TFM/ESP32/sim7000g-esp_modem_T2/managed_components/espressif__esp_modem/src/esp_modem_netif.cpp:67: undefined reference to `esp_netif_ppp_set_params'

It's related to netif, but at the moment I can't find the solution. Did it happen to someone else?

Thanks.

[nicklasb]

I have an error when i try to build this project ( https://github.com/U03/esp_modem_test ):

Just wanted to say I have the same problem.
For some reason the esp-modem component can't get to some of the esp_netif stuff.
Going crazy.

BTW; the project shown seem to manually add the "components" library, is that necessary?

[nicklasb]

I have an error when i try to build this project ( https://github.com/U03/esp_modem_test ):

I solved it, at least for me, now it builds.
I took a real deep-dive and found this in netif:s CMakeLists.txt:

Code: [Select all] [Expand/Collapse]

1. if(CONFIG_PPP_SUPPORT)
2. list(APPEND srcs "lwip/esp_netif_lwip_ppp.c")
3. endif()

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Apparently,

Code: Select all

Component config > LWIP > Enable PPP support (new/experimental)

..must be enabled for it to be compiled or else the implementation file lwip/esp_netif_lwip_ppp.c will not be included.

Which means that neither will be any declarations that tries to point to it.

[da_789]

Thank you! I'll try to replicate it.

Can you use gps functions with esp_modem and sim7000?