在SF7中设置了MBED OS 5.9 LoRA

问题描述

您知道如何在Mbed-OS LoRaWAN协议API中将扩展因子设置为12，以使用OTAA连接到LoRaWAN网络吗?

Do you know how to set up the Spreading Factor to 12 in a Mbed-OS LoRaWAN protocol APIs to connect to a LoRaWAN network using OTAA?

我试图使LoRA节点使用扩展因子SF12，因为默认值是SF7.我知道在PHY层中，我们可以更改无线电配置.有几个示例可以在不同的亚GHz频段之间进行切换，但是，我找不到一个如何在7至12之间更改带宽为125 kHz的LoRa调制SF的方法.我正在EU 868 MHz配置中使用SX1276无线电.

I'm trying to make LoRA node to use Spreading Factor SF12, because the default one is SF7. I know that in the PHY layer we can change Radio configurations. There are several examples to change between the different sub-GHz frequency bands, however, I can't find one on how to change the LoRa modulation SF between 7 and 12 and with a bandwidth of 125 kHz.I'm using an SX1276 radio at EU 868 MHz config.

在来源中代码，您可以找到SF7-12的不同配置，但是没有明确的设置方法.这些配置是定义(#define)DR_0，DR_等).

In the source code you can find the SF7-12 different configurations, but there is not a clear way to set it up. These configs are the definitions (#define) DR_0, DR_, etc ).

在Phy部分的配置文件中，您会找到类似以下的示例:

In the configuration file in the Phy part you find some example like this:

        "phy": {
        "help": "LoRa PHY region. 0 = EU868 (default), 1 = AS923,
         2 = AU915, 3 = CN470, 4 = CN779, 5 = EU433,
         6 = IN865, 7 = KR920, 8 = US915, 9 = US915_HYBRID",
        "value": "0"
    },

但是没有传播因子的例子或描述.

But there is no examples or description for the Spreading Factor.

我想通过源代码而不是配置文件来更改它.

I would like to change it via source code, rather than the configuration file.

在乔恩回答之后，我添加了以下几行，但仍然没有强制使用SF12 Joins.

after Jon's answer, I add the following lines, but still not forcing the SF12 Joins.

retcode = lorawan.disable_adaptive_datarate ();
retcode = lorawan.set_datarate (0); //  DR_0

推荐答案

致电:

lorawan.set_datarate(0); // SF12 125 KHz

请确保:

1. 禁用ADR.
2. 使用ABP，或在JOIN_SUCCESS事件处理程序中调用上面的函数.这是因为加入过程始终从SF7开始，然后保持成功加入的数据速率.

1. Disable ADR.
2. Either use ABP, or call the function above in the JOIN_SUCCESS event handler. This is because join procedure always starts at SF7, and then keeps the data rate on which the join succeeded.

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