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Reading battery level from peripheral BLE to central BLE to iOS app.

mzarling

I have a BLE device acting as a central and a peripheral, relaying information between that peripheral and a custom iOS app. As a central, it reads (not notifications) the battery level of another BLE acting as a peripheral. This is working fine. I see the battery level of the peripheral being reported in RTT. On this relay BLE device, I have ble_bas_c related code working fine. However I can't seem to get the ble_bas related code working so that the iOS app can read that same battery level. There is another battery service that is working fine for the iOS app to read the BLE relay device battery level.

  • 0

    I have the peripheral/central relay device reading the peripheral battery level every 20 seconds. The battery service for the end peripheral is showing in the iOS app, but just stays with the initialized value.

  • 0

    Hi,

    Just to clarify: The issue here is that the battery level relayed from the central/peripheral device is not updated? Have you tried with our nRF Connect app to see if there is anything different? 

    Dont know if this will help but have you tried with other phones?

  • 0 in reply to Mttrinh

    Doesn't work with iPhone or Android mobiles. There is something I'm missing to get the battery level through the BLE device that is acting as a Central/Collector and a Peripheral. It is reading the battery level from the end BLE peripheral (target) with "ble_bas_c_bl_read" which RTT shows is working fine. It's structure is identified with BLE_BAS_C_DEF(m_bas_c). The structure BLE_BAS_DEF(m_bas_target) is defined for the battery service that the mobile app sees. How is the connection made between these two battery services to get the data from the end BLE, through another BLE and to the mobile app?

  • 0 in reply to Mttrinh

    Have you taken a look at the relay example we have in the SDK? If not, I would suggest you to have a look at the Experimental: BLE Relay Example, I think it will give you an idea on how to do it.

  • 0 in reply to Mttrinh

    I was already reviewing the BLE Relay Example, but it wasn't relaying a battery service. I used the heart rate service relay as an example for a battery service relay, but I was still having issues. Then I found out that the target  peripheral was not actually notifying the battery level. I didn't write the firmware for the target peripheral, but I have access to the source. On the Central device, I saw that I was getting a BLE_BAS_C_EVT_BATT_READ_RESP instead of a BLE_BAS_C_EVT_BATT_NOTIFICATION so I placed the call for battery_level_update in the bas_c_evt_handler at the switch case BLE_BAS_C_EVT_BATT_READ_RESP instead of the switch case  BLE_BAS_C_EVT_BATT_NOTIFICATION. It working now. I am able to see the target peripheral battery level through the central and then to the mobile app.

    Please let me know if there is a reason I shouldn't be doing it this way.

    Thank you for your help.

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