RAK811 Tracker Board - Lost frames



  • Hi,
    I am working with a RAK811 Tracker Board and a RAK831 gateway.

    I have programmed the RAK811 Tracker Board with the ClassA firmware downloaded from https://github.com/RAKWireless/RAK811_BreakBoard.
    I have modified this firmware to work in US915_Hybrid Region.

    The problem I have is that some frames are lost. I have verified it using the TTN console.

    The person who configured the gateway, told me that it is working in the following subband:

    	"SX1301_conf": {
    		"lorawan_public": true,
    		"clksrc": 1,
    		"clksrc_desc": "radio_1 provides clock to concentrator",
    		"antenna_gain": 0,
    		"antenna_gain_desc": "antenna gain, in dBi",
    		"radio_0": {
    			"enable": true,
    			"type": "SX1257",
    			"freq": 904300000,
    			"rssi_offset": -166.0,
    			"tx_enable": true,
    			"tx_freq_min": 923000000,
    			"tx_freq_max": 928000000
    		},
    		"radio_1": {
    			"enable": true,
    			"type": "SX1257",
    			"freq": 905000000,
    			"rssi_offset": -166.0,
    			"tx_enable": false
    		},
    		"chan_multiSF_0": {
    			"desc": "Lora MAC, 125kHz, all SF, 903.9 MHz",
    			"enable": true,
    			"radio": 0,
    			"if": -400000
    		},
    		"chan_multiSF_1": {
    			"desc": "Lora MAC, 125kHz, all SF, 904.1 MHz",
    			"enable": true,
    			"radio": 0,
    			"if": -200000
    		},
    		"chan_multiSF_2": {
    			"desc": "Lora MAC, 125kHz, all SF, 904.3 MHz",
    			"enable": true,
    			"radio": 0,
    			"if": 0
    		},
    		"chan_multiSF_3": {
    			"desc": "Lora MAC, 125kHz, all SF, 904.5 MHz",
    			"enable": true,
    			"radio": 0,
    			"if": 200000
    		},
    		"chan_multiSF_4": {
    			"desc": "Lora MAC, 125kHz, all SF, 904.7 MHz",
    			"enable": true,
    			"radio": 1,
    			"if": -300000
    		},
    		"chan_multiSF_5": {
    			"desc": "Lora MAC, 125kHz, all SF, 904.9 MHz",
    			"enable": true,
    			"radio": 1,
    			"if": -100000
    		},
    		"chan_multiSF_6": {
    			"desc": "Lora MAC, 125kHz, all SF, 905.1 MHz",
    			"enable": true,
    			"radio": 1,
    			"if": 100000
    		},
    		"chan_multiSF_7": {
    			"desc": "Lora MAC, 125kHz, all SF, 905.3 MHz",
    			"enable": true,
    			"radio": 1,
    			"if": 300000
    		},
    		"chan_Lora_std": {
    			"desc": "Lora MAC, 500kHz, SF8, 904.6 MHz",
    			"enable": true,
    			"radio": 0,
    			"if": 300000,
    			"bandwidth": 500000,
    			"spread_factor": 8
    		},
    

    So, I have modified de function "RegionUS915HybridInitDefaults()" of the "ClassA" source code as follows:

    ChannelsDefaultMask[0] = 0xFF00;  //Ch 8 to 15 enabled.
            	ChannelsDefaultMask[1] = 0x0000;  
            	ChannelsDefaultMask[2] = 0x0000;  
           	ChannelsDefaultMask[3] = 0x0000;  
            	ChannelsDefaultMask[4] = 0x0002; //Ch 65 enabled.
         	ChannelsDefaultMask[5] = 0x0000;
    

    I do not know if I have to do another modification.

    I would appreciate if anybody can help me.

    Thanks.


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