Resolve TLS Issue for GPS Transmission -Fixing HTTP payload - 05/03/2026 03:11 EST

@nicolasalexandro

Hey — saw your post about resolving the TLS issue for GPS transmission on the AVR-IoT Cellular Mini. When TLS starts failing on constrained devices like the Monarch 2, it’s usually a mix of certificate handling and how the HTTP payload is framed over the secure socket. Quick question before I suggest an approach: Are you terminating TLS directly on the modem with its built‑in stack, or handling it on the MCU side and just using the modem as a data pipe? I’ve helped debug similar TLS + HTTP issues on cellular IoT boards (including Sequans-based modules), mainly around CA roots, SNI, and payload formatting. If you can share your current code snippet for the TLS setup and HTTP POST/GET, plus the server endpoint you’re hitting, I can review and tell you exactly where it’s likely breaking.

@adnans092

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@Hemantt841

I understand you require a solution to the TLS handshake failure caused by the “CA certificate input too long” error on the AVR-IoT Cellular Mini while sending GPS data over HTTPS. You’ve already confirmed the payload structure is correct and are now focused on proper certificate handling and TLS configuration to ensure your backend receives the latitude, longitude, and timestamp data reliably. With over 15 years of experience and 200+ completed projects involving Linux, network security, API integration, and backend development, I have worked extensively on embedded systems and IoT devices using Arduino and microcontrollers. I am familiar with handling certificate formats and memory constraints on devices like the Sequans Monarch 2 modem. I will analyze the current certificate format and convert the ISRG Root X1 from PEM to DER if necessary, optimizing for size limitations. I’ll then help configure the TLS stack on your device to complete the handshake successfully and verify the HTTPS POST reaches your REST API endpoint within your specified time interval. This approach should resolve the HTTPS connectivity and data transmission issues within a short turnaround. Feel free to share more details or questions so we can get this TLS issue fixed and your GPS data flowing smoothly.

@mykolan65

Hi there This will work only if the modem trust store, certificate format, and HTTPS flow are matched correctly to Sequans Monarch 2 limits before touching your payload logic. The likely blockers are oversized root CA input, wrong PEM vs DER format, full-chain vs root-only confusion, SNI or hostname mismatch, and TLS settings that the modem rejects even though the backend is fine. In the first hour I will inspect how the certificate is loaded into the modem, then test the smallest valid chain and verify the HTTPS POST path with the exact endpoint and TLS settings. Are you loading the cert through AT commands or from Arduino firmware storage? Does your backend require full Let’s Encrypt chain validation or can it accept a smaller trusted CA path? I’ve debugged embedded HTTPS and modem integrations where the real issue was certificate handling, chain size, and TLS setup rather than the JSON or API itself. I can start quickly and get the GPS POST reaching your backend cleanly. Hope to discuss more on chat. Mykola Nahurskyi

@Xakimbek007

Hello, I can help resolve the TLS configuration issue on your AVR-IoT Cellular Mini and ensure your device successfully sends GPS data to your backend via HTTPS. I have experience working with microcontrollers, TLS configuration, and API integrations. I will diagnose the certificate loading problem, handle the CA size limitation (including converting PEM to DER if required), and correctly configure the Sequans Monarch 2 modem so the TLS handshake succeeds. Once TLS is functioning, I will verify that your Arduino firmware can reliably send the GPS payload (latitude, longitude, timestamp) to your REST API endpoint at the required interval. I’ll also test the HTTPS POST flow and confirm that the data is received and visible on your backend. Deliverables include the working TLS configuration, guidance on certificate handling for the modem, and verified GPS data transmission to your API. Best regards

@emmanuelv0826

As an experienced full-stack developer, I specialize in API integration and backend development, which are two skills that your project heavily relies on. Over the years, I have built numerous APIs and RESTful services, enabling seamless integration between various systems. In addition to my broad skill set, I'm also highly skilled in handling JSON data - just like the data your GPS system generates. I have also successfully resolved multiple issues with HTTPS and TLS during project deliveries. Moreover, I have a good understanding of communication between devices and servers to ensure accurate payload transmission. This is crucial as any error during data manipulation can lead to failure in transmitting GPS data as you are currently experiencing.

@hannas62

Hello, I'm Hanna, and I have a significant experience in both Backend Development and Electronics that would be a perfect fit for your TLS issue resolution project. I understand the frustrations of being locked out in the middle of a project due to configuration issues, but worry not, I know my way around these technical hurdles. Throughout my career, I've successfully solved numerous similar issues, configuring HTTPS integrations and resolving TLS handshake failures. Specifically, my expertise with CA certificates might prove crucial here. I've dealt with different certificate formats in the past and can decipher any conversion complexities you might encounter. Furthermore, my approach of building understanding on foundational concepts and problem-solving frameworks could help find an optimal solution even considering the size limitations of the Sequans modem and streamline the successful delivery of your GPS data to the backend as per your required time frames. With me on board, you can rest assured that your Arduino firmware will perform efficiently and accurately transmit GPS data consistently. Let's discuss your project further! Thanks!

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@zacsin9

Hey — saw your post about fixing the TLS issue for GPS transmission on the AVR-IoT Cellular Mini. When TLS starts failing on these constrained modems, it’s usually either a certificate/CA mismatch or how the HTTP payload is being built and sent over the socket. Quick question before I suggest an approach: Are you using the modem’s built-in HTTP/TLS stack, or are you handling raw AT commands and crafting the HTTPS request manually? I’ve worked with LTE-M/NB-IoT modules (including Monarch-based) and debugged TLS handshakes, cert chains, and payload formatting for GPS/telemetry uploads to cloud endpoints. If you share your current AT command sequence, payload example, and target server URL/cert details, I can review and point out exactly where it’s breaking.

@mohanrc40

Hello, I can help you resolve the TLS certificate issue on the AVR-IoT Cellular Mini with the Sequans Monarch 2 modem. I have experience working with Arduino firmware, microcontrollers, REST API integration, and secure HTTPS communication. Based on your description, the problem is likely related to the CA certificate size limitation in the modem. I can assist in converting the certificate to DER format, optimizing the certificate chain, and properly configuring TLS so the modem can successfully complete the handshake and send the GPS data (latitude, longitude, timestamp) to your backend API. I will also verify the HTTPS POST request, ensure the JSON payload is correctly transmitted, and confirm that the GPS data is successfully received on your backend. My goal is to quickly diagnose the certificate loading issue and implement a stable solution so your firmware can reliably push GPS data at the required intervals. Looking forward to working with you. Best regards, Mohan R

@combicloud

Hi! I'm a UK-based developer, new to Freelancer and keen to prove myself. No job too small for me to deliver professionally. Your TLS issue with the AVR-IoT Cellular Mini is a classic certificate format problem. The Sequans Monarch 2 modem has a size limit on PEM certificates, and the ISRG Root X1 in PEM format exceeds it. Here's what I believe will fix this: 1. Convert the certificate from PEM to DER format. DER is binary and significantly smaller than PEM (which is Base64-encoded). The Sequans modem should accept the DER version without the "CA certificate input too long" error. 2. If DER still exceeds the limit, we can use the shorter intermediate certificate (Let's Encrypt R3 or R11) instead of the full root CA. Many embedded modems work fine with just the intermediate cert for TLS verification. 3. Once the certificate loads successfully, I'll help you verify the TLS handshake completes and your HTTPS POST delivers the JSON GPS payload (lat, long, timestamp) to your backend endpoint. 4. I'll also check your AT command sequence for the modem's TLS configuration to make sure the cipher suite and certificate slot are set correctly. Being UK-based, I'm in your timezone and available for quick back-and-forth debugging. Happy to jump on this today!