In IoT project deployment, choosing the right data connectivity architecture is often more important than selecting the terminal device itself.

Common questions during system design include:

• How can BLE devices connect to the cloud?

• How can wired devices be converted to wireless networking?

• If broadband is unavailable, is 4G the only option?

• Do medical and industrial systems require integrated gateways?

Many IoT projects experience instability, packet loss, or high maintenance costs after deployment. In most cases, the root cause lies in improper access layer architecture design.

To address these challenges, Alinket Technology has developed a complete IoT access layer product portfolio built around BLE and Ethernet devices, including:

• DGW810 (BLE → Wi-Fi Gateway)

• DGW412 (BLE → 4G Gateway)

• ALXB10 (Ethernet → Wi-Fi Bridge)

• ALXB15i (High-performance Ethernet → Wi-Fi Bridge)

• ALXR10 (Integrated BLE / Ethernet / Wi-Fi / 4G Gateway)

1. Core Challenges of the IoT Access Layer

A typical IoT architecture consists of five layers:

• Device Layer (Sensors / Devices)

• Access Layer (Gateway / Bridge)

• Network Layer (Wi-Fi / LTE / Ethernet)

• Platform Layer (Cloud / Private Server)

• Application Layer (Medical systems / Industrial platforms)

Among these layers, the access layer determines overall system stability.

Its three key functions include:

1. Protocol conversion (BLE / Ethernet → IP)

2. Network adaptation (Wi-Fi / LTE connectivity)

3. Reliable data transmission (buffering, reconnection, QoS)

If the access layer is poorly designed, common issues may occur:

• Unstable device connections

• Data packet loss

• Insufficient bandwidth

• High communication latency

• NAT modifications affecting legacy systems

Therefore, selecting an IoT gateway is essentially a communication architecture design decision.

2. IoT Connectivity Architecture Models

2.1 BLE Device Connectivity Model

Data path:

BLE Device → Gateway (BLE Master) → IP Network → Cloud

Key technologies include:

• BLE master mode connection management

• Multi-device concurrent scheduling (≤4 devices)

• RSSI optimization and link stability control

• Data buffering and automatic reconnection

• MQTT / LwM2M / HTTP protocol encapsulation

Typical applications include:

• ECG patches

• Pulse oximeters

• Body temperature sensors

• Wearable health devices

• Environmental BLE sensors

Fixed Wi-Fi Environment — DGW810

When stable Wi-Fi infrastructure is available:

BLE → DGW810 → Wi-Fi → Cloud Server

Key advantages:

• BLE 4.2 master mode

• Supports connection with up to 4 BLE devices

• Dual-band Wi-Fi (2.4G / 5G)

• Low standby power consumption (1.2W)

• Supports MQTT / LwM2M / HTTP protocols

• Data caching with automatic reconnection

Typical scenarios:

• Hospital wards

• Home healthcare monitoring

• Smart home environments

• Laboratory data collection

This is the most cost-efficient and easiest deployment solution.

Mobile or No Broadband Scenario — DGW412

Data path:

BLE → DGW412 → 4G → Cloud Server

Key features:

• BLE 5.0 (-100 dBm receiver sensitivity)

• 4G Cat1 global connectivity

• Built-in 3000 mAh battery

• OLED real-time status display

Typical scenarios:

• Mobile healthcare

• Home visit medical monitoring

• Emergency monitoring

• Outdoor equipment networking

If local network infrastructure is unavailable or mobility is required, the DGW412 is the recommended solution.

2.2 Wireless Transformation of Wired Devices

Data path:

Ethernet Device → Layer-2 Bridge → Wi-Fi → LAN / Cloud

Key technologies:

• Layer-2 transparent forwarding

• MAC layer bridging

• No NAT modification

• Original protocol unchanged

• Fast roaming mechanism

Standard Wireless Upgrade — ALXB10

Typical applications:

• Patient monitors

• Ventilators

• Industrial PLC systems

• Energy data collection equipment

Technical features:

• Layer-2 bridge architecture

• 10M/100M adaptive Ethernet

• 2.4G / 5G Wi-Fi support

• Industrial temperature range (-40°C ~ 85°C)

• Plug-and-play deployment

Advantages:

• No changes to existing IP architecture

• No modification of original communication protocols

• No increase in system complexity

• This solution is ideal for cost-sensitive IoT projects.

High Stability & High Density Deployment — ALXB15i

Upgraded capabilities:

• Supports 802.11ac

• MU-MIMO technology

• Dual SMA external antennas

• Stronger interference resistance

• Higher throughput performance

Recommended for:

• Industrial factories

• High-density hospital equipment areas

• Electromagnetic interference environments

• Industrial control systems requiring low latency

When wireless environments are complex or real-time performance is critical, ALXB15i is the preferred choice.

2.3 Integrated IoT Access Model

In complex deployments, systems often include:

• BLE devices

• Wired equipment

• Wi-Fi networks

• Remote 4G connectivity

Using multiple independent devices may cause:

• Complex architecture

• Difficult maintenance

• Increased costs

Integrated Gateway Solution — ALXR10

Supported interfaces:

• BLE connectivity

• Ethernet uplink/downlink

• Wi-Fi connectivity

• 4G uplink

Supported architecture combinations:

• BLE → Wi-Fi

• BLE → 4G

• BLE → Ethernet

• Wi-Fi → 4G

• Wi-Fi → Ethernet

• Ethernet → Wi-Fi

• Ethernet → 4G

Key advantages:

• Multi-protocol integration

• LTE Cat4 connectivity

• Battery power support

• Built-in RTC

• Digital input interface support

• Multi-link redundancy capability

Typical applications:

• Integrated healthcare systems

• Industrial equipment management

• Energy monitoring platforms

• Remote operation and maintenance systems

For complex system architectures, integrated gateways significantly reduce deployment complexity.

3. Communication Reliability Mechanisms

1. Automatic Reconnection

Link status monitoring

Automatic redial mechanism

Local data buffering

Confirmed retransmission

Ensures temporary network interruptions do not cause data loss.

2. Data Security

Supported security technologies include:

WPA / WPA2 encryption

AES / TKIP security protocols

TLS cloud communication support

These features meet security requirements for industrial and medical applications.

3. Multi-Link Deployment Strategy

Primary Wi-Fi connection + 4G backup

Dual communication redundancy

Remote firmware upgrades

This architecture significantly improves system reliability and availability.

4. Gateway Selection Methodology

Selecting the right IoT gateway requires answering three questions.

1. Terminal Interface Type

BLE devices → DGW810 / DGW412

Wired devices → ALXB10 / ALXB15i

Mixed devices → ALXR10

2. Network Environment

Stable Wi-Fi available → Wi-Fi gateway

No Wi-Fi → 4G gateway

Dual network redundancy → Integrated gateway

3. Deployment Mode

Fixed installation → Wi-Fi connectivity

Mobile deployment → 4G connectivity

Complex system integration → Integrated gateway

5. Conclusion

In smart healthcare and industrial IoT applications, system stability is determined not by the number of features but by the correctness of the architecture design.

Alinket provides a complete IoT access layer solution through:

• BLE gateways

• Wi-Fi bridges

• 4G gateways

• Integrated data gateways

These solutions help customers achieve:

• Lower deployment costs

• Higher communication stability

• Greater system scalability

• Reduced maintenance complexity