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TTGO T-A7670 E board - No Internet connection via LTE #174

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opened 2026-10-05 05:45:27 +02:00 by adam · 9 comments
adam commented 2026-10-05 05:45:27 +02:00
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Hi Ricardo,

great job and many thanks for this project.
I tried to establish a LoRa APRS iGate via mobile Internet Connection with a TTGO T-A7670 E R2.
The web flashing process works fine .
But as soon as i switch on >Enable APRS-IS connection< , >SAVE< and reboot the device,
the boot process stucks as following (Version 2.2.2):
CALLSIGN-xx
Opening Port...

I think, it is due to the missing mobile internet connection . There is no PIN on my simcard...
In Germany it is mandantory to fill in the >APN< and the >username< for a mobile internet connection by your carrier e.g. Deutsche Telekom. Otherwise the mobile network refuses the Internet Access by the device.
A decription of the AT command is in the following datasheet: https://www.simcom.com/product/A7670X.html
=> A76XX Series_AT_Command_Manual_V1.06.pdf

Would it be possible to provide such input fields for APN and username in one of the next releases of your software for the TTGO T A7670X ?

vy 73 de
Martin DG3SBI

Hi Ricardo, great job and many thanks for this project. I tried to establish a LoRa APRS iGate via mobile Internet Connection with a TTGO T-A7670 E R2. The web flashing process works fine . But as soon as i switch on >Enable APRS-IS connection< , >SAVE< and reboot the device, the boot process stucks as following (Version 2.2.2): *CALLSIGN-xx* Opening Port... I think, it is due to the missing mobile internet connection . There is no PIN on my simcard... In Germany it is mandantory to fill in the >APN< **and** the >username< for a mobile internet connection by your carrier e.g. Deutsche Telekom. Otherwise the mobile network refuses the Internet Access by the device. A decription of the AT command is in the following datasheet: https://www.simcom.com/product/A7670X.html => A76XX Series_AT_Command_Manual_V1.06.pdf Would it be possible to provide such input fields for APN and username in one of the next releases of your software for the TTGO T A7670X ? vy 73 de Martin DG3SBI <!-- github-sync-id:2797220328 -->
adam commented 2026-10-05 05:45:28 +02:00
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Hi

Sure I can add this ... are you willing to help me test this too?

This way we can create it faster

I use telegram (same user as github)

Hi Sure I can add this ... are you willing to help me test this too? This way we can create it faster I use telegram (same user as github) <!-- github-comment-id:2600117667 -->
adam commented 2026-10-05 05:45:29 +02:00
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Hi Ricardo,
of course i will support you by testing.
So far, i have no telegram account...
I am not so familiar with the classic ESP flashing process. But with a
little assistance / description we will succeed.
Regards
Martin DG3SBI

Gesendet mit der Telekom Mail App
https://kommunikationsdienste.t-online.de/redirects/email_app_android_sendmail_footer

--- Original-Nachricht ---
Von: Ricardo Guzman (Richonguzman)
Betreff: Re: [richonguzman/LoRa_APRS_iGate] TTGO T-A7670 E board - No
Internet connection via LTE (Issue #234)
Datum: 18. Januar 2025, 22:52
An: richonguzman/LoRa_APRS_iGate
Cc: DG3SBI, Author

Hi

Sure I can add this ... are you willing to help me test this too?

This way we can create it faster

I use telegram (same user as github)

—
Reply to this email directly, view it on GitHub
https://github.com/richonguzman/LoRa_APRS_iGate/issues/234#issuecomment-2600117667
, or unsubscribe
https://github.com/notifications/unsubscribe-auth/BOUJG3YSGC2Y6DVSGWPGFIT2LLEH7AVCNFSM6AAAAABVN753JGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMBQGEYTONRWG4
.
You are receiving this because you authored the thread.Message ID:
@.***>

Hi Ricardo, of course i will support you by testing. So far, i have no telegram account... I am not so familiar with the classic ESP flashing process. But with a little assistance / description we will succeed. Regards Martin DG3SBI ------------------------------------------------------------------------ Gesendet mit der Telekom Mail App <https://kommunikationsdienste.t-online.de/redirects/email_app_android_sendmail_footer> --- Original-Nachricht --- Von: Ricardo Guzman (Richonguzman) Betreff: Re: [richonguzman/LoRa_APRS_iGate] TTGO T-A7670 E board - No Internet connection via LTE (Issue #234) Datum: 18. Januar 2025, 22:52 An: richonguzman/LoRa_APRS_iGate Cc: DG3SBI, Author Hi Sure I can add this ... are you willing to help me test this too? This way we can create it faster I use telegram (same user as github) — Reply to this email directly, view it on GitHub <https://github.com/richonguzman/LoRa_APRS_iGate/issues/234#issuecomment-2600117667> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/BOUJG3YSGC2Y6DVSGWPGFIT2LLEH7AVCNFSM6AAAAABVN753JGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMBQGEYTONRWG4> . You are receiving this because you authored the thread.Message ID: ***@***.***> <!-- github-comment-id:2600183850 -->
adam commented 2026-10-05 05:45:29 +02:00
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Any message app you use?

Or just plain emails?

Saludos,

Ricardo / Richon
(Enviado desde mi celular a tubos)

El 18-01-2025, a las 7:17 p. m., DG3SBI @.***> escribió:



Hi Ricardo,
of course i will support you by testing.
So far, i have no telegram account...
I am not so familiar with the classic ESP flashing process. But with a
little assistance / description we will succeed.
Regards
Martin DG3SBI

Gesendet mit der Telekom Mail App
https://kommunikationsdienste.t-online.de/redirects/email_app_android_sendmail_footer

--- Original-Nachricht ---
Von: Ricardo Guzman (Richonguzman)
Betreff: Re: [richonguzman/LoRa_APRS_iGate] TTGO T-A7670 E board - No
Internet connection via LTE (Issue #234)
Datum: 18. Januar 2025, 22:52
An: richonguzman/LoRa_APRS_iGate
Cc: DG3SBI, Author

Hi

Sure I can add this ... are you willing to help me test this too?

This way we can create it faster

I use telegram (same user as github)

—
Reply to this email directly, view it on GitHub
https://github.com/richonguzman/LoRa_APRS_iGate/issues/234#issuecomment-2600117667
, or unsubscribe
https://github.com/notifications/unsubscribe-auth/BOUJG3YSGC2Y6DVSGWPGFIT2LLEH7AVCNFSM6AAAAABVN753JGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMBQGEYTONRWG4
.
You are receiving this because you authored the thread.Message ID:
@.***>

—
Reply to this email directly, view it on GitHubhttps://github.com/richonguzman/LoRa_APRS_iGate/issues/234#issuecomment-2600183850, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AQWBUGSNBSF4UHBV4G7VSET2LLHH3AVCNFSM6AAAAABVN753JGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMBQGE4DGOBVGA.
You are receiving this because you commented.Message ID: @.***>

Any message app you use? Or just plain emails? Saludos, Ricardo / Richon (Enviado desde mi celular a tubos) El 18-01-2025, a las 7:17 p. m., DG3SBI ***@***.***> escribió:  Hi Ricardo, of course i will support you by testing. So far, i have no telegram account... I am not so familiar with the classic ESP flashing process. But with a little assistance / description we will succeed. Regards Martin DG3SBI ------------------------------------------------------------------------ Gesendet mit der Telekom Mail App <https://kommunikationsdienste.t-online.de/redirects/email_app_android_sendmail_footer> --- Original-Nachricht --- Von: Ricardo Guzman (Richonguzman) Betreff: Re: [richonguzman/LoRa_APRS_iGate] TTGO T-A7670 E board - No Internet connection via LTE (Issue #234) Datum: 18. Januar 2025, 22:52 An: richonguzman/LoRa_APRS_iGate Cc: DG3SBI, Author Hi Sure I can add this ... are you willing to help me test this too? This way we can create it faster I use telegram (same user as github) — Reply to this email directly, view it on GitHub <https://github.com/richonguzman/LoRa_APRS_iGate/issues/234#issuecomment-2600117667> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/BOUJG3YSGC2Y6DVSGWPGFIT2LLEH7AVCNFSM6AAAAABVN753JGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMBQGEYTONRWG4> . You are receiving this because you authored the thread.Message ID: ***@***.***> — Reply to this email directly, view it on GitHub<https://github.com/richonguzman/LoRa_APRS_iGate/issues/234#issuecomment-2600183850>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AQWBUGSNBSF4UHBV4G7VSET2LLHH3AVCNFSM6AAAAABVN753JGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMBQGE4DGOBVGA>. You are receiving this because you commented.Message ID: ***@***.***> <!-- github-comment-id:2600222759 -->
adam commented 2026-10-05 05:45:30 +02:00
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Due to lots of spam and ID-spoofing, i reduced the use of message apps to an absolute minimum.
=> contact prefered by plain eMail.
Regards
Martin DG3SBI

Due to lots of spam and ID-spoofing, i reduced the use of message apps to an absolute minimum. => contact prefered by plain eMail. Regards Martin DG3SBI <!-- github-comment-id:2600985114 -->
adam commented 2026-10-05 05:45:31 +02:00
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Looking at other firmwares that had the same problem, you should insert this string: AT+CGDCONT=1,"IP","your.apn.here" somewhere that Ricardo might know.
I'm waiting for a TTgo with 4G too and I already know that my telephone operator needs to configure the "apn" so I will soon have the same problem too

Looking at other firmwares that had the same problem, you should insert this string: AT+CGDCONT=1,"IP","your.apn.here" somewhere that Ricardo might know. I'm waiting for a TTgo with 4G too and I already know that my telephone operator needs to configure the "apn" so I will soon have the same problem too <!-- github-comment-id:2889086816 -->
adam commented 2026-10-05 05:45:31 +02:00
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Looking at other firmwares that had the same problem, you should insert this string: AT+CGDCONT=1,"IP","your.apn.here" somewhere that Ricardo might know. I'm waiting for a TTgo with 4G too and I already know that my telephone operator needs to configure the "apn" so I will soon have the same problem too

let me know when it arrives to start getting a way to solve this together

> Looking at other firmwares that had the same problem, you should insert this string: AT+CGDCONT=1,"IP","your.apn.here" somewhere that Ricardo might know. I'm waiting for a TTgo with 4G too and I already know that my telephone operator needs to configure the "apn" so I will soon have the same problem too let me know when it arrives to start getting a way to solve this together <!-- github-comment-id:2889089958 -->
adam commented 2026-10-05 05:45:32 +02:00
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The module has arrived. With various changes made thanks to ChatGPT I managed to insert the APN configuration of my telephone operator into the firmware. It also connects to aprs.fi but does not release any beacon or data. I think the firmware is not compatible with any A7670x with lora module.

The module has arrived. With various changes made thanks to ChatGPT I managed to insert the APN configuration of my telephone operator into the firmware. It also connects to aprs.fi but does not release any beacon or data. I think the firmware is not compatible with any A7670x with lora module. <!-- github-comment-id:3012770846 -->
adam commented 2026-10-05 05:45:33 +02:00
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Is there any update on this?
I have now received my ESP32, SX1278 and A7670E and successfully connected them together already.
But the last thing I'm missing is the APN too.

Is there any update on this? I have now received my ESP32, SX1278 and A7670E and successfully connected them together already. But the last thing I'm missing is the APN too. <!-- github-comment-id:3697580753 -->
adam commented 2026-10-05 05:45:33 +02:00
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Ok, so I actually got it to work now. First using ChatGPT, then Claude found two important things. And in the end I connected CODEX to VSCode which was epic and then it worked right-away.

Also make sure you got the RX and TX pin right. I'm a microcontroller beginner and seem to have mixed those pins up definition-wise. If you get timeouts when trying to query or connect the A7670 modem that might be the case.

I have no idea how clean the solution is, but it connects to APRS-IS and sends the beacon and also feeds tracker packets into APRS-IS.

You only have to change the APN config in the complete code file here:

  const char* APN  = "internet.t-mobile.at";
  const char* USER = "";
  const char* PASS = "";

If anyone might need help on how to manually flash it to the ESP32 I'm happy to tell you, as I also just learned that a short time ago.

Edited code:
A7670_utils.cpp

Changes

  1. There are two helper functions created that add a more robust modem connection and debug outputs (from what I've understood)
  2. The APN consts have been added
  3. Some changes in void APRS_IS_connect() for more debug and the connect including the APN
  4. A7670 APRS-IS login responses (logresp, even with leading #) are now forwarded to processAPRSISPacket, so the APRS-IS verification line isn’t dropped.
  5. When the modem reports “verified” during APRS-IS login, passcodeValid is set to true immediately, allowing beacons to upload to APRS-IS.
Ok, so I actually got it to work now. First using ChatGPT, then Claude found two important things. And in the end I connected CODEX to VSCode which was epic and then it worked right-away. Also make sure you got the RX and TX pin right. I'm a microcontroller beginner and seem to have mixed those pins up definition-wise. If you get timeouts when trying to query or connect the A7670 modem that might be the case. I have no idea how clean the solution is, but it connects to APRS-IS and sends the beacon and also feeds tracker packets into APRS-IS. You only have to change the APN config in the complete code file here: ``` const char* APN = "internet.t-mobile.at"; const char* USER = ""; const char* PASS = ""; ``` If anyone might need help on how to manually flash it to the ESP32 I'm happy to tell you, as I also just learned that a short time ago. Edited code: [A7670_utils.cpp](https://github.com/user-attachments/files/24399819/A7670_utils.cpp) ### Changes 1. There are two helper functions created that add a more robust modem connection and debug outputs (from what I've understood) 2. The APN consts have been added 3. Some changes in `void APRS_IS_connect()` for more debug and the connect including the APN 4. A7670 APRS-IS login responses (logresp, even with leading #) are now forwarded to processAPRSISPacket, so the APRS-IS verification line isn’t dropped. 5. When the modem reports “verified” during APRS-IS login, passcodeValid is set to true immediately, allowing beacons to upload to APRS-IS. <!-- github-comment-id:3703411925 -->
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Reference: adam/LoRa_APRS_iGate#174